Remove double-nested reversible command when note editing
[ardour.git] / gtk2_ardour / editor_ops.cc
index d79813ab352edb3f6626336c6d6cfdb28a02da98..512648993c462e7ce869bf4a99936e01b92610b9 100644 (file)
 #include <cstdlib>
 #include <cmath>
 #include <string>
+#include <limits>
 #include <map>
 #include <set>
 
+#include <gtkmm/messagedialog.h>
+
 #include "pbd/error.h"
 #include "pbd/basename.h"
 #include "pbd/pthread_utils.h"
 #include "pbd/whitespace.h"
 #include "pbd/stateful_diff_command.h"
 
-#include <gtkmm2ext/utils.h>
-#include <gtkmm2ext/choice.h>
-#include <gtkmm2ext/popup.h>
+#include "gtkmm2ext/utils.h"
+
+#include "widgets/choice.h"
+#include "widgets/popup.h"
+#include "widgets/prompter.h"
 
 #include "ardour/audio_track.h"
 #include "ardour/audioregion.h"
+#include "ardour/boost_debug.h"
 #include "ardour/dB.h"
 #include "ardour/location.h"
 #include "ardour/midi_region.h"
 #include "ardour/midi_track.h"
 #include "ardour/operations.h"
 #include "ardour/playlist_factory.h"
+#include "ardour/profile.h"
 #include "ardour/quantize.h"
+#include "ardour/legatize.h"
 #include "ardour/region_factory.h"
 #include "ardour/reverse.h"
 #include "ardour/session.h"
 #include "ardour/session_playlists.h"
 #include "ardour/strip_silence.h"
 #include "ardour/transient_detector.h"
+#include "ardour/transpose.h"
 
 #include "canvas/canvas.h"
 
 #include "actions.h"
-#include "ardour_ui.h"
 #include "audio_region_view.h"
 #include "audio_streamview.h"
 #include "audio_time_axis.h"
+#include "automation_region_view.h"
 #include "automation_time_axis.h"
 #include "control_point.h"
 #include "debug.h"
 #include "editor_regions.h"
 #include "editor_routes.h"
 #include "gui_thread.h"
-#include "insert_time_dialog.h"
+#include "insert_remove_time_dialog.h"
 #include "interthread_progress_window.h"
+#include "item_counts.h"
 #include "keyboard.h"
 #include "midi_region_view.h"
+#include "mixer_ui.h"
 #include "mixer_strip.h"
 #include "mouse_cursors.h"
 #include "normalize_dialog.h"
+#include "note.h"
+#include "paste_context.h"
 #include "patch_change_dialog.h"
 #include "quantize_dialog.h"
 #include "region_gain_line.h"
 #include "streamview.h"
 #include "strip_silence_dialog.h"
 #include "time_axis_view.h"
+#include "timers.h"
 #include "transpose_dialog.h"
+#include "transform_dialog.h"
+#include "ui_config.h"
 
-#include "i18n.h"
+#include "pbd/i18n.h"
 
 using namespace std;
 using namespace ARDOUR;
 using namespace PBD;
 using namespace Gtk;
 using namespace Gtkmm2ext;
+using namespace ArdourWidgets;
 using namespace Editing;
 using Gtkmm2ext::Keyboard;
 
@@ -108,35 +125,59 @@ using Gtkmm2ext::Keyboard;
 void
 Editor::undo (uint32_t n)
 {
+       if (_session && _session->actively_recording()) {
+               /* no undo allowed while recording. Session will check also,
+                  but we don't even want to get to that.
+               */
+               return;
+       }
+
        if (_drags->active ()) {
                _drags->abort ();
        }
-       
+
        if (_session) {
                _session->undo (n);
+               if (_session->undo_depth() == 0) {
+                       undo_action->set_sensitive(false);
+               }
+               redo_action->set_sensitive(true);
+               begin_selection_op_history ();
        }
 }
 
 void
 Editor::redo (uint32_t n)
 {
+       if (_session && _session->actively_recording()) {
+               /* no redo allowed while recording. Session will check also,
+                  but we don't even want to get to that.
+               */
+               return;
+       }
+
        if (_drags->active ()) {
                _drags->abort ();
        }
-       
+
        if (_session) {
-               _session->redo (n);
+       _session->redo (n);
+               if (_session->redo_depth() == 0) {
+                       redo_action->set_sensitive(false);
+               }
+               undo_action->set_sensitive(true);
+               begin_selection_op_history ();
        }
 }
 
 void
-Editor::split_regions_at (framepos_t where, RegionSelection& regions)
+Editor::split_regions_at (MusicFrame where, RegionSelection& regions, bool snap_frame)
 {
        bool frozen = false;
 
        RegionSelection pre_selected_regions = selection->regions;
        bool working_on_selection = !pre_selected_regions.empty();
-       
+
        list<boost::shared_ptr<Playlist> > used_playlists;
        list<RouteTimeAxisView*> used_trackviews;
 
@@ -156,10 +197,14 @@ Editor::split_regions_at (framepos_t where, RegionSelection& regions)
                case SnapToRegionEnd:
                        break;
                default:
-                       snap_to (where);
+                       if (snap_frame) {
+                               snap_to (where);
+                       }
                }
        } else {
-               snap_to (where);
+               if (snap_frame) {
+                       snap_to (where);
+               }
 
                frozen = true;
                EditorFreeze(); /* Emit Signal */
@@ -173,7 +218,7 @@ Editor::split_regions_at (framepos_t where, RegionSelection& regions)
                   have something to split.
                */
 
-               if (!(*a)->region()->covers (where)) {
+               if (!(*a)->region()->covers (where.frame)) {
                        ++a;
                        continue;
                }
@@ -212,13 +257,13 @@ Editor::split_regions_at (framepos_t where, RegionSelection& regions)
                a = tmp;
        }
 
+       latest_regionviews.clear ();
+
        vector<sigc::connection> region_added_connections;
 
        for (list<RouteTimeAxisView*>::iterator i = used_trackviews.begin(); i != used_trackviews.end(); ++i) {
                region_added_connections.push_back ((*i)->view()->RegionViewAdded.connect (sigc::mem_fun(*this, &Editor::collect_new_region_view)));
        }
-       
-       latest_regionviews.clear ();
 
        while (used_playlists.size() > 0) {
                list <boost::shared_ptr<Playlist > >::iterator i = used_playlists.begin();
@@ -229,21 +274,47 @@ Editor::split_regions_at (framepos_t where, RegionSelection& regions)
        for (vector<sigc::connection>::iterator c = region_added_connections.begin(); c != region_added_connections.end(); ++c) {
                (*c).disconnect ();
        }
-       
-       commit_reversible_command ();
 
        if (frozen){
                EditorThaw(); /* Emit Signal */
        }
 
-       //IFF we were working on selected regions, try to reinstate the other region selections that existed before the freeze/thaw.
-       _ignore_follow_edits = true;  //a split will change the region selection in mysterious ways;  its not practical or wanted to follow this edit
-       if( working_on_selection ) {
-               selection->add ( pre_selected_regions );
-               selection->add (latest_regionviews);  //these are the new regions created after the split
+       if (working_on_selection) {
+               // IFF we were working on selected regions, try to reinstate the other region selections that existed before the freeze/thaw.
+
+               RegionSelectionAfterSplit rsas = Config->get_region_selection_after_split();
+               /* There are three classes of regions that we might want selected after
+                  splitting selected regions:
+                   - regions selected before the split operation, and unaffected by it
+                   - newly-created regions before the split
+                   - newly-created regions after the split
+                */
+
+               if (rsas & Existing) {
+                       // region selections that existed before the split.
+                       selection->add ( pre_selected_regions );
+               }
+
+               for (RegionSelection::iterator ri = latest_regionviews.begin(); ri != latest_regionviews.end(); ri++) {
+                       if ((*ri)->region()->position() < where.frame) {
+                               // new regions created before the split
+                               if (rsas & NewlyCreatedLeft) {
+                                       selection->add (*ri);
+                               }
+                       } else {
+                               // new regions created after the split
+                               if (rsas & NewlyCreatedRight) {
+                                       selection->add (*ri);
+                               }
+                       }
+               }
+       } else {
+               if( working_on_selection ) {
+                       selection->add (latest_regionviews);  //these are the new regions created after the split
+               }
        }
-       _ignore_follow_edits = false;
 
+       commit_reversible_command ();
 }
 
 /** Move one extreme of the current range selection.  If more than one range is selected,
@@ -288,9 +359,9 @@ Editor::move_range_selection_start_or_end_to_region_boundary (bool move_end, boo
                return;
        }
 
-       begin_reversible_command (_("alter selection"));
+       begin_reversible_selection_op (_("alter selection"));
        selection->set_preserving_all_ranges (start, end);
-       commit_reversible_command ();
+       commit_reversible_selection_op ();
 }
 
 bool
@@ -352,8 +423,8 @@ Editor::nudge_forward (bool next, bool force_playhead)
        } else if (!force_playhead && !selection->markers.empty()) {
 
                bool is_start;
-
-               begin_reversible_command (_("nudge location forward"));
+               bool in_command = false;
+               const int32_t divisions = get_grid_music_divisions (0);
 
                for (MarkerSelection::iterator i = selection->markers.begin(); i != selection->markers.end(); ++i) {
 
@@ -369,9 +440,9 @@ Editor::nudge_forward (bool next, bool force_playhead)
                                                distance = next_distance;
                                        }
                                        if (max_framepos - distance > loc->start() + loc->length()) {
-                                               loc->set_start (loc->start() + distance);
+                                               loc->set_start (loc->start() + distance, false, true, divisions);
                                        } else {
-                                               loc->set_start (max_framepos - loc->length());
+                                               loc->set_start (max_framepos - loc->length(), false, true, divisions);
                                        }
                                } else {
                                        distance = get_nudge_distance (loc->end(), next_distance);
@@ -379,18 +450,26 @@ Editor::nudge_forward (bool next, bool force_playhead)
                                                distance = next_distance;
                                        }
                                        if (max_framepos - distance > loc->end()) {
-                                               loc->set_end (loc->end() + distance);
+                                               loc->set_end (loc->end() + distance, false, true, divisions);
                                        } else {
-                                               loc->set_end (max_framepos);
+                                               loc->set_end (max_framepos, false, true, divisions);
                                        }
+                                       if (loc->is_session_range()) {
+                                               _session->set_end_is_free (false);
+                                       }
+                               }
+                               if (!in_command) {
+                                       begin_reversible_command (_("nudge location forward"));
+                                       in_command = true;
                                }
                                XMLNode& after (loc->get_state());
                                _session->add_command (new MementoCommand<Location>(*loc, &before, &after));
                        }
                }
 
-               commit_reversible_command ();
-
+               if (in_command) {
+                       commit_reversible_command ();
+               }
        } else {
                distance = get_nudge_distance (playhead_cursor->current_frame (), next_distance);
                _session->request_locate (playhead_cursor->current_frame () + distance);
@@ -437,8 +516,7 @@ Editor::nudge_backward (bool next, bool force_playhead)
        } else if (!force_playhead && !selection->markers.empty()) {
 
                bool is_start;
-
-               begin_reversible_command (_("nudge location forward"));
+               bool in_command = false;
 
                for (MarkerSelection::iterator i = selection->markers.begin(); i != selection->markers.end(); ++i) {
 
@@ -454,9 +532,9 @@ Editor::nudge_backward (bool next, bool force_playhead)
                                                distance = next_distance;
                                        }
                                        if (distance < loc->start()) {
-                                               loc->set_start (loc->start() - distance);
+                                               loc->set_start (loc->start() - distance, false, true, get_grid_music_divisions(0));
                                        } else {
-                                               loc->set_start (0);
+                                               loc->set_start (0, false, true, get_grid_music_divisions(0));
                                        }
                                } else {
                                        distance = get_nudge_distance (loc->end(), next_distance);
@@ -466,18 +544,25 @@ Editor::nudge_backward (bool next, bool force_playhead)
                                        }
 
                                        if (distance < loc->end() - loc->length()) {
-                                               loc->set_end (loc->end() - distance);
+                                               loc->set_end (loc->end() - distance, false, true, get_grid_music_divisions(0));
                                        } else {
-                                               loc->set_end (loc->length());
+                                               loc->set_end (loc->length(), false, true, get_grid_music_divisions(0));
+                                       }
+                                       if (loc->is_session_range()) {
+                                               _session->set_end_is_free (false);
                                        }
                                }
-
+                               if (!in_command) {
+                                       begin_reversible_command (_("nudge location forward"));
+                                       in_command = true;
+                               }
                                XMLNode& after (loc->get_state());
                                _session->add_command (new MementoCommand<Location>(*loc, &before, &after));
                        }
                }
-
-               commit_reversible_command ();
+               if (in_command) {
+                       commit_reversible_command ();
+               }
 
        } else {
 
@@ -545,9 +630,9 @@ Editor::nudge_backward_capture_offset ()
 }
 
 struct RegionSelectionPositionSorter {
-        bool operator() (RegionView* a, RegionView* b) {
-                return a->region()->position() < b->region()->position();
-        }
+       bool operator() (RegionView* a, RegionView* b) {
+               return a->region()->position() < b->region()->position();
+       }
 };
 
 void
@@ -567,7 +652,8 @@ Editor::sequence_regions ()
 
        if (!rs.empty()) {
 
-               begin_reversible_command (_("sequence regions"));
+               bool in_command = false;
+
                for (RegionSelection::iterator i = rs.begin(); i != rs.end(); ++i) {
                        boost::shared_ptr<Region> r ((*i)->region());
 
@@ -587,15 +673,22 @@ Editor::sequence_regions ()
                                r->set_position(r_end_prev);
                        }
 
+                       if (!in_command) {
+                               begin_reversible_command (_("sequence regions"));
+                               in_command = true;
+                       }
                        _session->add_command (new StatefulDiffCommand (r));
 
                        r_end=r->position() + r->length();
 
                        iCount++;
                }
-               commit_reversible_command ();
-       } 
-} 
+
+               if (in_command) {
+                       commit_reversible_command ();
+               }
+       }
+}
 
 
 /* DISPLAY MOTION */
@@ -644,13 +737,13 @@ Editor::build_region_boundary_cache ()
                break;
        default:
                fatal << string_compose (_("build_region_boundary_cache called with snap_type = %1"), _snap_type) << endmsg;
-               /*NOTREACHED*/
+               abort(); /*NOTREACHED*/
                return;
        }
 
        TimeAxisView *ontrack = 0;
        TrackViewList tlist;
-       
+
        if (!selection->tracks.empty()) {
                tlist = selection->tracks.filter_to_unique_playlists ();
        } else {
@@ -1067,7 +1160,7 @@ Editor::selected_marker_to_region_boundary (bool with_selection, int32_t dir)
                return;
        }
 
-       loc->move_to (target);
+       loc->move_to (target, 0);
 }
 
 void
@@ -1144,7 +1237,7 @@ Editor::selected_marker_to_region_point (RegionPoint point, int32_t dir)
 
        pos = track_frame_to_session_frame(pos, speed);
 
-       loc->move_to (pos);
+       loc->move_to (pos, 0);
 }
 
 void
@@ -1191,7 +1284,7 @@ Editor::selected_marker_to_selection_start ()
                return;
        }
 
-       loc->move_to (pos);
+       loc->move_to (pos, 0);
 }
 
 void
@@ -1226,7 +1319,7 @@ Editor::selected_marker_to_selection_end ()
                return;
        }
 
-       loc->move_to (pos);
+       loc->move_to (pos, 0);
 }
 
 void
@@ -1278,6 +1371,7 @@ Editor::cursor_align (bool playhead_to_edit)
                _session->request_locate (selection->markers.front()->position(), _session->transport_rolling());
 
        } else {
+               const int32_t divisions = get_grid_music_divisions (0);
                /* move selected markers to playhead */
 
                for (MarkerSelection::iterator i = selection->markers.begin(); i != selection->markers.end(); ++i) {
@@ -1286,10 +1380,10 @@ Editor::cursor_align (bool playhead_to_edit)
                        Location* loc = find_location_from_marker (*i, ignored);
 
                        if (loc->is_mark()) {
-                               loc->set_start (playhead_cursor->current_frame ());
+                               loc->set_start (playhead_cursor->current_frame (), false, true, divisions);
                        } else {
                                loc->set (playhead_cursor->current_frame (),
-                                         playhead_cursor->current_frame () + loc->length());
+                                         playhead_cursor->current_frame () + loc->length(), true, divisions);
                        }
                }
        }
@@ -1362,11 +1456,26 @@ Editor::scroll_tracks_up_line ()
        reset_y_origin (vertical_adjustment.get_value() - 60);
 }
 
+void
+Editor::select_topmost_track ()
+{
+       const double top_of_trackviews = vertical_adjustment.get_value();
+       for (TrackViewList::iterator t = track_views.begin(); t != track_views.end(); ++t) {
+               if ((*t)->hidden()) {
+                       continue;
+               }
+               std::pair<TimeAxisView*,double> res = (*t)->covers_y_position (top_of_trackviews);
+               if (res.first) {
+                       selection->set (*t);
+                       break;
+               }
+       }
+}
+
 bool
-Editor::scroll_down_one_track ()
+Editor::scroll_down_one_track (bool skip_child_views)
 {
-       TrackViewList::reverse_iterator next = track_views.rbegin();
-       std::pair<TimeAxisView*,double> res;
+       TrackViewList::reverse_iterator next = track_views.rend();
        const double top_of_trackviews = vertical_adjustment.get_value();
 
        for (TrackViewList::reverse_iterator t = track_views.rbegin(); t != track_views.rend(); ++t) {
@@ -1374,63 +1483,204 @@ Editor::scroll_down_one_track ()
                        continue;
                }
 
-               next = t;
-               if (next != track_views.rbegin()) {
-                       --next; // moves "next" towards the lower/later tracks since it is a reverse iterator
-               }
-
                /* If this is the upper-most visible trackview, we want to display
-                  the one above it (next)
-               */
-
-               res = (*t)->covers_y_position (top_of_trackviews);
+                * the one above it (next)
+                *
+                * Note that covers_y_position() is recursive and includes child views
+                */
+               std::pair<TimeAxisView*,double> res = (*t)->covers_y_position (top_of_trackviews);
 
                if (res.first) {
+                       if (skip_child_views) {
+                               break;
+                       }
+                       /* automation lane (one level, non-recursive)
+                        *
+                        * - if no automation lane exists -> move to next tack
+                        * - if the first (here: bottom-most) matches -> move to next tack
+                        * - if no y-axis match is found -> the current track is at the top
+                        *     -> move to last (here: top-most) automation lane
+                        */
+                       TimeAxisView::Children kids = (*t)->get_child_list();
+                       TimeAxisView::Children::reverse_iterator nkid = kids.rend();
+
+                       for (TimeAxisView::Children::reverse_iterator ci = kids.rbegin(); ci != kids.rend(); ++ci) {
+                               if ((*ci)->hidden()) {
+                                       continue;
+                               }
+
+                               std::pair<TimeAxisView*,double> dev;
+                               dev = (*ci)->covers_y_position (top_of_trackviews);
+                               if (dev.first) {
+                                       /* some automation lane is currently at the top */
+                                       if (ci == kids.rbegin()) {
+                                               /* first (bottom-most) autmation lane is at the top.
+                                                * -> move to next track
+                                                */
+                                               nkid = kids.rend();
+                                       }
+                                       break;
+                               }
+                               nkid = ci;
+                       }
+
+                       if (nkid != kids.rend()) {
+                               ensure_time_axis_view_is_visible (**nkid, true);
+                               return true;
+                       }
                        break;
                }
+               next = t;
        }
 
        /* move to the track below the first one that covers the */
-       
-       if (next != track_views.rbegin()) {
+
+       if (next != track_views.rend()) {
                ensure_time_axis_view_is_visible (**next, true);
                return true;
        }
 
        return false;
-}      
+}
 
 bool
-Editor::scroll_up_one_track ()
+Editor::scroll_up_one_track (bool skip_child_views)
 {
        TrackViewList::iterator prev = track_views.end();
-       std::pair<TimeAxisView*,double> res;
        double top_of_trackviews = vertical_adjustment.get_value ();
-       
+
        for (TrackViewList::iterator t = track_views.begin(); t != track_views.end(); ++t) {
 
                if ((*t)->hidden()) {
                        continue;
                }
 
-               /* find the trackview at the top of the trackview group */
-               res = (*t)->covers_y_position (top_of_trackviews);
-               
+               /* find the trackview at the top of the trackview group
+                *
+                * Note that covers_y_position() is recursive and includes child views
+                */
+               std::pair<TimeAxisView*,double> res = (*t)->covers_y_position (top_of_trackviews);
+
                if (res.first) {
+                       if (skip_child_views) {
+                               break;
+                       }
+                       /* automation lane (one level, non-recursive)
+                        *
+                        * - if no automation lane exists -> move to prev tack
+                        * - if no y-axis match is found -> the current track is at the top -> move to prev track
+                        *     (actually last automation lane of previous track, see below)
+                        * - if first (top-most) lane is at the top -> move to this track
+                        * - else move up one lane
+                        */
+                       TimeAxisView::Children kids = (*t)->get_child_list();
+                       TimeAxisView::Children::iterator pkid = kids.end();
+
+                       for (TimeAxisView::Children::iterator ci = kids.begin(); ci != kids.end(); ++ci) {
+                               if ((*ci)->hidden()) {
+                                       continue;
+                               }
+
+                               std::pair<TimeAxisView*,double> dev;
+                               dev = (*ci)->covers_y_position (top_of_trackviews);
+                               if (dev.first) {
+                                       /* some automation lane is currently at the top */
+                                       if (ci == kids.begin()) {
+                                               /* first (top-most) autmation lane is at the top.
+                                                * jump directly to this track's top
+                                                */
+                                               ensure_time_axis_view_is_visible (**t, true);
+                                               return true;
+                                       }
+                                       else if (pkid != kids.end()) {
+                                               /* some other automation lane is at the top.
+                                                * move up to prev automation lane.
+                                                */
+                                               ensure_time_axis_view_is_visible (**pkid, true);
+                                               return true;
+                                       }
+                                       assert(0); // not reached
+                                       break;
+                               }
+                               pkid = ci;
+                       }
                        break;
                }
 
                prev = t;
        }
-       
+
        if (prev != track_views.end()) {
-               ensure_time_axis_view_is_visible (**prev, true);
+               // move to bottom-most automation-lane of the previous track
+               TimeAxisView::Children kids = (*prev)->get_child_list();
+               TimeAxisView::Children::reverse_iterator pkid = kids.rend();
+               if (!skip_child_views) {
+                       // find the last visible lane
+                       for (TimeAxisView::Children::reverse_iterator ci = kids.rbegin(); ci != kids.rend(); ++ci) {
+                               if (!(*ci)->hidden()) {
+                                       pkid = ci;
+                                       break;
+                               }
+                       }
+               }
+               if (pkid != kids.rend()) {
+                       ensure_time_axis_view_is_visible (**pkid, true);
+               } else  {
+                       ensure_time_axis_view_is_visible (**prev, true);
+               }
                return true;
        }
 
        return false;
 }
 
+void
+Editor::scroll_left_step ()
+{
+       framepos_t xdelta = (current_page_samples() / 8);
+
+       if (leftmost_frame > xdelta) {
+               reset_x_origin (leftmost_frame - xdelta);
+       } else {
+               reset_x_origin (0);
+       }
+}
+
+
+void
+Editor::scroll_right_step ()
+{
+       framepos_t xdelta = (current_page_samples() / 8);
+
+       if (max_framepos - xdelta > leftmost_frame) {
+               reset_x_origin (leftmost_frame + xdelta);
+       } else {
+               reset_x_origin (max_framepos - current_page_samples());
+       }
+}
+
+void
+Editor::scroll_left_half_page ()
+{
+       framepos_t xdelta = (current_page_samples() / 2);
+       if (leftmost_frame > xdelta) {
+               reset_x_origin (leftmost_frame - xdelta);
+       } else {
+               reset_x_origin (0);
+       }
+}
+
+void
+Editor::scroll_right_half_page ()
+{
+       framepos_t xdelta = (current_page_samples() / 2);
+       if (max_framepos - xdelta > leftmost_frame) {
+               reset_x_origin (leftmost_frame + xdelta);
+       } else {
+               reset_x_origin (max_framepos - current_page_samples());
+       }
+}
+
 /* ZOOM */
 
 void
@@ -1445,7 +1695,7 @@ Editor::tav_zoom_step (bool coarser)
        } else {
                ts = &selection->tracks;
        }
-       
+
        for (TrackViewList::iterator i = ts->begin(); i != ts->end(); ++i) {
                TimeAxisView *tv = (static_cast<TimeAxisView*>(*i));
                        tv->step_height (coarser);
@@ -1464,7 +1714,7 @@ Editor::tav_zoom_smooth (bool coarser, bool force_all)
        } else {
                ts = &selection->tracks;
        }
-       
+
        for (TrackViewList::iterator i = ts->begin(); i != ts->end(); ++i) {
                TimeAxisView *tv = (static_cast<TimeAxisView*>(*i));
                uint32_t h = tv->current_height ();
@@ -1482,20 +1732,90 @@ Editor::tav_zoom_smooth (bool coarser, bool force_all)
        }
 }
 
+void
+Editor::temporal_zoom_step_mouse_focus_scale (bool zoom_out, double scale)
+{
+       Editing::ZoomFocus temp_focus = zoom_focus;
+       zoom_focus = Editing::ZoomFocusMouse;
+       temporal_zoom_step_scale (zoom_out, scale);
+       zoom_focus = temp_focus;
+}
+
+void
+Editor::temporal_zoom_step_mouse_focus (bool zoom_out)
+{
+       temporal_zoom_step_mouse_focus_scale (zoom_out, 2.0);
+}
+
+void
+Editor::temporal_zoom_step (bool zoom_out)
+{
+       temporal_zoom_step_scale (zoom_out, 2.0);
+}
 
 void
-Editor::temporal_zoom_step (bool coarser)
+Editor::temporal_zoom_step_scale (bool zoom_out, double scale)
 {
-       ENSURE_GUI_THREAD (*this, &Editor::temporal_zoom_step, coarser)
+       ENSURE_GUI_THREAD (*this, &Editor::temporal_zoom_step, zoom_out, scale)
 
        framecnt_t nspp = samples_per_pixel;
 
-       if (coarser) {
-               nspp *= 2;
+       if (zoom_out) {
+               nspp *= scale;
+               if (nspp == samples_per_pixel) {
+                       nspp *= 2.0;
+               }
        } else {
-               nspp /= 2;
+               nspp /= scale;
+               if (nspp == samples_per_pixel) {
+                       nspp /= 2.0;
+               }
        }
-
+       
+       // ToDo:   encapsulate all of this into something like editor::get_session_extents() or editor::leftmost(), rightmost()
+       {
+               //ToDo: also incorporate automation regions (in case the session has no audio/midi but is just used for automating plugins or the like)
+               
+               //calculate the extents of all regions in every playlist
+               framecnt_t session_extent_start = 0;
+               framecnt_t session_extent_end = 0;
+               {
+                       boost::shared_ptr<RouteList> rl = _session->get_routes();
+                       for (RouteList::iterator r = rl->begin(); r != rl->end(); ++r) {
+                               boost::shared_ptr<Track> tr = boost::dynamic_pointer_cast<Track> (*r);
+                               if (tr) {
+                                       boost::shared_ptr<Playlist> pl = tr->playlist();
+                                       if (pl) {
+                                               pair<framepos_t, framepos_t> e;
+                                               e = pl->get_extent();
+                                               if (e.first < session_extent_start) {
+                                                       session_extent_start = e.first;
+                                               }
+                                               if (e.second > session_extent_end) {
+                                                       session_extent_end = e.second;
+                                               }
+                                       }
+                               }
+                       }
+               }
+               framecnt_t session_extents = session_extent_end - session_extent_start;
+               
+               //in a session with no regions, use the start/end markers to set max zoom
+               framecnt_t const session_length = _session->current_end_frame() - _session->current_start_frame ();
+               if ( session_length > session_extents )
+                       session_extents = session_length;
+                       
+               //in a session with no regions or start/end markers, use 2 minutes to set max zoom
+               framecnt_t const min_length = _session->nominal_frame_rate()*60*2;
+               if ( min_length > session_extents )
+                       session_extents = min_length;
+                       
+               //convert to samples-per-pixel and limit our zoom to this value
+               framecnt_t session_extents_pp = session_extents / _visible_canvas_width;
+               if (nspp > session_extents_pp)
+                       nspp = session_extents_pp;
+       }
+       
        temporal_zoom (nspp);
 }
 
@@ -1515,6 +1835,7 @@ Editor::temporal_zoom (framecnt_t fpp)
        framepos_t leftmost_after_zoom = 0;
        framepos_t where;
        bool in_track_canvas;
+       bool use_mouse_frame = true;
        framecnt_t nfpp;
        double l;
 
@@ -1522,7 +1843,7 @@ Editor::temporal_zoom (framecnt_t fpp)
                return;
        }
 
-       // Imposing an arbitrary limit to zoom out as too much zoom out produces 
+       // Imposing an arbitrary limit to zoom out as too much zoom out produces
        // segfaults for lack of memory. If somebody decides this is not high enough I
        // believe it can be raisen to higher values but some limit must be in place.
        //
@@ -1531,7 +1852,7 @@ Editor::temporal_zoom (framecnt_t fpp)
        // would be 4147200000 samples, so 2592000 samples per pixel.
 
        nfpp = min (fpp, (framecnt_t) 2592000);
-       nfpp = max ((framecnt_t) 1, fpp);
+       nfpp = max ((framecnt_t) 1, nfpp);
 
        new_page_size = (framepos_t) floor (_visible_canvas_width * nfpp);
        half_page_size = new_page_size / 2;
@@ -1575,18 +1896,13 @@ Editor::temporal_zoom (framecnt_t fpp)
        case ZoomFocusMouse:
                /* try to keep the mouse over the same point in the display */
 
-               if (!mouse_frame (where, in_track_canvas)) {
-                       /* use playhead instead */
-                       where = playhead_cursor->current_frame ();
-
-                       if (where < half_page_size) {
-                               leftmost_after_zoom = 0;
-                       } else {
-                               leftmost_after_zoom = where - half_page_size;
-                       }
-
-               } else {
+               if (_drags->active()) {
+                       where = _drags->current_pointer_frame ();
+               } else if (!mouse_frame (where, in_track_canvas)) {
+                       use_mouse_frame = false;
+               }
 
+               if (use_mouse_frame) {
                        l = - ((new_page_size * ((where - current_leftmost)/(double)current_page)) - where);
 
                        if (l < 0) {
@@ -1596,8 +1912,16 @@ Editor::temporal_zoom (framecnt_t fpp)
                        } else {
                                leftmost_after_zoom = (framepos_t) l;
                        }
-               }
+               } else {
+                       /* use playhead instead */
+                       where = playhead_cursor->current_frame ();
 
+                       if (where < half_page_size) {
+                               leftmost_after_zoom = 0;
+                       } else {
+                               leftmost_after_zoom = where - half_page_size;
+                       }
+               }
                break;
 
        case ZoomFocusEdit:
@@ -1638,14 +1962,14 @@ Editor::calc_extra_zoom_edges(framepos_t &start, framepos_t &end)
        */
 
        GdkScreen* screen = gdk_screen_get_default ();
-       gint pixwidth = gdk_screen_get_width (screen);
-       gint mmwidth = gdk_screen_get_width_mm (screen);
-       double pix_per_mm = (double) pixwidth/ (double) mmwidth;
-       double one_centimeter_in_pixels = pix_per_mm * 10.0;
+       const gint pixwidth = gdk_screen_get_width (screen);
+       const gint mmwidth = gdk_screen_get_width_mm (screen);
+       const double pix_per_mm = (double) pixwidth/ (double) mmwidth;
+       const double one_centimeter_in_pixels = pix_per_mm * 10.0;
 
-       framepos_t range = end - start;
-       double new_fpp = (double) range / (double) _visible_canvas_width;
-       framepos_t extra_samples = (framepos_t) floor (one_centimeter_in_pixels * new_fpp);
+       const framepos_t range = end - start;
+       const framecnt_t new_fpp = (framecnt_t) ceil ((double) range / (double) _visible_canvas_width);
+       const framepos_t extra_samples = (framepos_t) floor (one_centimeter_in_pixels * new_fpp);
 
        if (start > extra_samples) {
                start -= extra_samples;
@@ -1660,108 +1984,73 @@ Editor::calc_extra_zoom_edges(framepos_t &start, framepos_t &end)
        }
 }
 
-
-void
-Editor::temporal_zoom_region (bool both_axes)
+bool
+Editor::get_selection_extents (framepos_t &start, framepos_t &end) const
 {
-       framepos_t start = max_framepos;
-       framepos_t end = 0;
-       set<TimeAxisView*> tracks;
+       start = max_framepos;
+       end = 0;
+       bool ret = true;
 
-       RegionSelection rs = get_regions_from_selection_and_entered ();
+       //ToDo:  if notes are selected, set extents to that selection
 
-       if (rs.empty()) {
-               return;
-       }
+       //ToDo:  if control points are selected, set extents to that selection
 
-       for (RegionSelection::iterator i = rs.begin(); i != rs.end(); ++i) {
+       if ( !selection->regions.empty() ) {
+               RegionSelection rs = get_regions_from_selection_and_entered ();
 
-               if ((*i)->region()->position() < start) {
-                       start = (*i)->region()->position();
-               }
+               for (RegionSelection::iterator i = rs.begin(); i != rs.end(); ++i) {
 
-               if ((*i)->region()->last_frame() + 1 > end) {
-                       end = (*i)->region()->last_frame() + 1;
+                       if ((*i)->region()->position() < start) {
+                               start = (*i)->region()->position();
+                       }
+
+                       if ((*i)->region()->last_frame() + 1 > end) {
+                               end = (*i)->region()->last_frame() + 1;
+                       }
                }
 
-               tracks.insert (&((*i)->get_time_axis_view()));
-       }
+       } else if (!selection->time.empty()) {
+               start = selection->time.start();
+               end = selection->time.end_frame();
+       } else
+               ret = false;  //no selection found
 
+       //range check
        if ((start == 0 && end == 0) || end < start) {
-               return;
+               ret = false;
        }
 
-       calc_extra_zoom_edges(start, end);
-
-       /* if we're zooming on both axes we need to save track heights etc.
-        */
-
-       undo_visual_stack.push_back (current_visual_state (both_axes));
-
-       PBD::Unwinder<bool> nsv (no_save_visual, true);
+       return ret;
+}
 
-       temporal_zoom_by_frame (start, end);
-       
-       if (both_axes) {
-               uint32_t per_track_height = (uint32_t) floor ((_visible_canvas_height - 10.0) / tracks.size());
 
-               /* set visible track heights appropriately */
+void
+Editor::temporal_zoom_selection (Editing::ZoomAxis axes)
+{
+       if (!selection) return;
 
-               for (set<TimeAxisView*>::iterator t = tracks.begin(); t != tracks.end(); ++t) {
-                       (*t)->set_height (per_track_height);
-               }
+       //ToDo:  if notes are selected, zoom to that
 
-               /* hide irrelevant tracks */
+       //ToDo:  if control points are selected, zoom to that
 
-               DisplaySuspender ds;
+       if (axes == Horizontal || axes == Both) {
 
-               for (TrackViewList::iterator i = track_views.begin(); i != track_views.end(); ++i) {
-                       if (find (tracks.begin(), tracks.end(), (*i)) == tracks.end()) {
-                               hide_track_in_display (*i);
-                       }
+               framepos_t start, end;
+               if (get_selection_extents (start, end)) {
+                       calc_extra_zoom_edges (start, end);
+                       temporal_zoom_by_frame (start, end);
                }
-
-               vertical_adjustment.set_value (0.0);
        }
 
-       redo_visual_stack.push_back (current_visual_state (both_axes));
-}
-
-void
-Editor::zoom_to_region (bool both_axes)
-{
-       temporal_zoom_region (both_axes);
+       if (axes == Vertical || axes == Both) {
+               fit_selection ();
+       }
 }
 
 void
-Editor::temporal_zoom_selection (bool both_axes)
+Editor::temporal_zoom_session ()
 {
-       if (!selection) return;
-
-       //if a range is selected, zoom to that
-       if (!selection->time.empty()) {
-
-               framepos_t start = selection->time.start();
-               framepos_t end = selection->time.end_frame();
-
-               calc_extra_zoom_edges(start, end);
-
-               temporal_zoom_by_frame (start, end);
-
-               if (both_axes)
-                       fit_selected_tracks();
-
-       } else {
-               temporal_zoom_region(both_axes);
-       }
-
-
-}
-
-void
-Editor::temporal_zoom_session ()
-{
-       ENSURE_GUI_THREAD (*this, &Editor::temporal_zoom_session)
+       ENSURE_GUI_THREAD (*this, &Editor::temporal_zoom_session)
 
        if (_session) {
                framecnt_t start = _session->current_start_frame();
@@ -1800,9 +2089,9 @@ Editor::temporal_zoom_by_frame (framepos_t start, framepos_t end)
 
        framepos_t range = end - start;
 
-       double const new_fpp = (double) range / (double) _visible_canvas_width;
+       const framecnt_t new_fpp = (framecnt_t) ceil ((double) range / (double) _visible_canvas_width);
 
-       framepos_t new_page = (framepos_t) floor (_visible_canvas_width * new_fpp);
+       framepos_t new_page = range;
        framepos_t middle = (framepos_t) floor ((double) start + ((double) range / 2.0f));
        framepos_t new_leftmost = (framepos_t) floor ((double) middle - ((double) new_page / 2.0f));
 
@@ -1854,7 +2143,7 @@ Editor::temporal_zoom_to_frame (bool coarser, framepos_t frame)
        /* zoom focus is automatically taken as @param frame when this
           method is used.
        */
-       
+
        framepos_t new_leftmost = frame - (framepos_t)range_before;
 
        if (new_leftmost > frame) {
@@ -1872,12 +2161,12 @@ Editor::temporal_zoom_to_frame (bool coarser, framepos_t frame)
 bool
 Editor::choose_new_marker_name(string &name) {
 
-       if (!Config->get_name_new_markers()) {
+       if (!UIConfiguration::instance().get_name_new_markers()) {
                /* don't prompt user for a new name */
                return true;
        }
 
-       ArdourPrompter dialog (true);
+       Prompter dialog (true);
 
        dialog.set_prompt (_("New Name:"));
 
@@ -1922,14 +2211,16 @@ Editor::add_location_from_selection ()
        framepos_t end = selection->time[clicked_selection].end;
 
        _session->locations()->next_available_name(rangename,"selection");
-       Location *location = new Location (*_session, start, end, rangename, Location::IsRangeMarker);
+       Location *location = new Location (*_session, start, end, rangename, Location::IsRangeMarker, get_grid_music_divisions(0));
+
+       begin_reversible_command (_("add marker"));
 
-       _session->begin_reversible_command (_("add marker"));
        XMLNode &before = _session->locations()->get_state();
        _session->locations()->add (location, true);
        XMLNode &after = _session->locations()->get_state();
        _session->add_command(new MementoCommand<Locations>(*(_session->locations()), &before, &after));
-       _session->commit_reversible_command ();
+
+       commit_reversible_command ();
 }
 
 void
@@ -1943,13 +2234,75 @@ Editor::add_location_mark (framepos_t where)
        if (!choose_new_marker_name(markername)) {
                return;
        }
-       Location *location = new Location (*_session, where, where, markername, Location::IsMark);
-       _session->begin_reversible_command (_("add marker"));
+       Location *location = new Location (*_session, where, where, markername, Location::IsMark, get_grid_music_divisions (0));
+       begin_reversible_command (_("add marker"));
+
        XMLNode &before = _session->locations()->get_state();
        _session->locations()->add (location, true);
        XMLNode &after = _session->locations()->get_state();
        _session->add_command(new MementoCommand<Locations>(*(_session->locations()), &before, &after));
-       _session->commit_reversible_command ();
+
+       commit_reversible_command ();
+}
+
+void
+Editor::set_session_start_from_playhead ()
+{
+       if (!_session)
+               return;
+
+       Location* loc;
+       if ((loc = _session->locations()->session_range_location()) == 0) {  //should never happen
+               _session->set_session_extents ( _session->audible_frame(), _session->audible_frame() );
+       } else {
+               XMLNode &before = loc->get_state();
+
+               _session->set_session_extents ( _session->audible_frame(), loc->end() );
+
+               XMLNode &after = loc->get_state();
+
+               begin_reversible_command (_("Set session start"));
+
+               _session->add_command (new MementoCommand<Location>(*loc, &before, &after));
+
+               commit_reversible_command ();
+       }
+}
+
+void
+Editor::set_session_end_from_playhead ()
+{
+       if (!_session)
+               return;
+
+       Location* loc;
+       if ((loc = _session->locations()->session_range_location()) == 0) {  //should never happen
+               _session->set_session_extents ( _session->audible_frame(), _session->audible_frame() );
+       } else {
+               XMLNode &before = loc->get_state();
+
+               _session->set_session_extents ( loc->start(), _session->audible_frame() );
+
+               XMLNode &after = loc->get_state();
+
+               begin_reversible_command (_("Set session start"));
+
+               _session->add_command (new MementoCommand<Location>(*loc, &before, &after));
+
+               commit_reversible_command ();
+       }
+
+       _session->set_end_is_free (false);
+}
+
+
+void
+Editor::toggle_location_at_playhead_cursor ()
+{
+       if (!do_remove_location_at_playhead_cursor())
+       {
+               add_location_from_playhead_cursor();
+       }
 }
 
 void
@@ -1958,15 +2311,13 @@ Editor::add_location_from_playhead_cursor ()
        add_location_mark (_session->audible_frame());
 }
 
-void
-Editor::remove_location_at_playhead_cursor ()
+bool
+Editor::do_remove_location_at_playhead_cursor ()
 {
+       bool removed = false;
        if (_session) {
-
                //set up for undo
-               _session->begin_reversible_command (_("remove marker"));
                XMLNode &before = _session->locations()->get_state();
-               bool removed = false;
 
                //find location(s) at this time
                Locations::LocationList locs;
@@ -1977,14 +2328,22 @@ Editor::remove_location_at_playhead_cursor ()
                                removed = true;
                        }
                }
-               
+
                //store undo
                if (removed) {
+                       begin_reversible_command (_("remove marker"));
                        XMLNode &after = _session->locations()->get_state();
                        _session->add_command(new MementoCommand<Locations>(*(_session->locations()), &before, &after));
-                       _session->commit_reversible_command ();
+                       commit_reversible_command ();
                }
        }
+       return removed;
+}
+
+void
+Editor::remove_location_at_playhead_cursor ()
+{
+       do_remove_location_at_playhead_cursor ();
 }
 
 /** Add a range marker around each selected region */
@@ -1996,22 +2355,26 @@ Editor::add_locations_from_region ()
        if (rs.empty()) {
                return;
        }
+       bool commit = false;
 
-       _session->begin_reversible_command (selection->regions.size () > 1 ? _("add markers") : _("add marker"));
        XMLNode &before = _session->locations()->get_state();
 
        for (RegionSelection::iterator i = rs.begin (); i != rs.end (); ++i) {
 
                boost::shared_ptr<Region> region = (*i)->region ();
 
-               Location *location = new Location (*_session, region->position(), region->last_frame(), region->name(), Location::IsRangeMarker);
+               Location *location = new Location (*_session, region->position(), region->last_frame(), region->name(), Location::IsRangeMarker, 0);
 
                _session->locations()->add (location, true);
+               commit = true;
        }
 
-       XMLNode &after = _session->locations()->get_state();
-       _session->add_command (new MementoCommand<Locations>(*(_session->locations()), &before, &after));
-       _session->commit_reversible_command ();
+       if (commit) {
+               begin_reversible_command (selection->regions.size () > 1 ? _("add markers") : _("add marker"));
+               XMLNode &after = _session->locations()->get_state();
+               _session->add_command (new MementoCommand<Locations>(*(_session->locations()), &before, &after));
+               commit_reversible_command ();
+       }
 }
 
 /** Add a single range marker around all selected regions */
@@ -2024,7 +2387,6 @@ Editor::add_location_from_region ()
                return;
        }
 
-       _session->begin_reversible_command (_("add marker"));
        XMLNode &before = _session->locations()->get_state();
 
        string markername;
@@ -2042,12 +2404,13 @@ Editor::add_location_from_region ()
        }
 
        // single range spanning all selected
-       Location *location = new Location (*_session, selection->regions.start(), selection->regions.end_frame(), markername, Location::IsRangeMarker);
+       Location *location = new Location (*_session, selection->regions.start(), selection->regions.end_frame(), markername, Location::IsRangeMarker, 0);
        _session->locations()->add (location, true);
 
+       begin_reversible_command (_("add marker"));
        XMLNode &after = _session->locations()->get_state();
        _session->add_command (new MementoCommand<Locations>(*(_session->locations()), &before, &after));
-       _session->commit_reversible_command ();
+       commit_reversible_command ();
 }
 
 /* MARKS */
@@ -2064,7 +2427,7 @@ Editor::jump_forward_to_mark ()
        if (pos < 0) {
                return;
        }
-       
+
        _session->request_locate (pos, _session->transport_rolling());
 }
 
@@ -2077,6 +2440,14 @@ Editor::jump_backward_to_mark ()
 
        framepos_t pos = _session->locations()->first_mark_before (playhead_cursor->current_frame());
 
+       //handle the case where we are rolling, and we're less than one-half second past the mark, we want to go to the prior mark...
+       if ( _session->transport_rolling() ) {
+               if ( (playhead_cursor->current_frame() - pos) < _session->frame_rate()/2 ) {
+                       framepos_t prior = _session->locations()->first_mark_before ( pos );
+                       pos = prior;
+               }
+       }
+
        if (pos < 0) {
                return;
        }
@@ -2096,19 +2467,21 @@ Editor::set_mark ()
                return;
        }
 
-       _session->locations()->add (new Location (*_session, pos, 0, markername, Location::IsMark), true);
+       _session->locations()->add (new Location (*_session, pos, 0, markername, Location::IsMark, 0), true);
 }
 
 void
 Editor::clear_markers ()
 {
        if (_session) {
-               _session->begin_reversible_command (_("clear markers"));
+               begin_reversible_command (_("clear markers"));
+
                XMLNode &before = _session->locations()->get_state();
                _session->locations()->clear_markers ();
                XMLNode &after = _session->locations()->get_state();
                _session->add_command(new MementoCommand<Locations>(*(_session->locations()), &before, &after));
-               _session->commit_reversible_command ();
+
+               commit_reversible_command ();
        }
 }
 
@@ -2116,27 +2489,30 @@ void
 Editor::clear_ranges ()
 {
        if (_session) {
-               _session->begin_reversible_command (_("clear ranges"));
+               begin_reversible_command (_("clear ranges"));
+
                XMLNode &before = _session->locations()->get_state();
 
                _session->locations()->clear_ranges ();
 
                XMLNode &after = _session->locations()->get_state();
                _session->add_command(new MementoCommand<Locations>(*(_session->locations()), &before, &after));
-               _session->commit_reversible_command ();
+
+               commit_reversible_command ();
        }
 }
 
 void
 Editor::clear_locations ()
 {
-       _session->begin_reversible_command (_("clear locations"));
+       begin_reversible_command (_("clear locations"));
+
        XMLNode &before = _session->locations()->get_state();
        _session->locations()->clear ();
        XMLNode &after = _session->locations()->get_state();
        _session->add_command(new MementoCommand<Locations>(*(_session->locations()), &before, &after));
-       _session->commit_reversible_command ();
-       _session->locations()->clear ();
+
+       commit_reversible_command ();
 }
 
 void
@@ -2262,7 +2638,7 @@ Editor::play_from_edit_point_and_return ()
        framepos_t start_frame;
        framepos_t return_frame;
 
-       start_frame = get_preferred_edit_position (true);
+       start_frame = get_preferred_edit_position ( EDIT_IGNORE_PHEAD );
 
        if (_session->transport_rolling()) {
                _session->request_locate (start_frame, false);
@@ -2283,35 +2659,34 @@ Editor::play_from_edit_point_and_return ()
 void
 Editor::play_selection ()
 {
-       if (selection->time.empty()) {
+       framepos_t start, end;
+       if (!get_selection_extents ( start, end))
                return;
-       }
 
-       _session->request_play_range (&selection->time, true);
-}
+       AudioRange ar (start, end, 0);
+       list<AudioRange> lar;
+       lar.push_back (ar);
 
-framepos_t
-Editor::get_preroll ()
-{
-       return 1.0 /*Config->get_edit_preroll_seconds()*/ * _session->frame_rate();
+       _session->request_play_range (&lar, true);
 }
 
 
 void
-Editor::maybe_locate_with_edit_preroll ( framepos_t location )
+Editor::maybe_locate_with_edit_preroll (framepos_t location)
 {
-       if ( _session->transport_rolling() || !Config->get_follow_edits() || _ignore_follow_edits )
+       if ( _session->transport_rolling() || !UIConfiguration::instance().get_follow_edits() || _session->config.get_external_sync() )
                return;
 
-       location -= get_preroll();
-       
+       location -= _session->preroll_samples (location);
+
        //don't try to locate before the beginning of time
-       if ( location < 0 ) 
+       if (location < 0) {
                location = 0;
-               
+       }
+
        //if follow_playhead is on, keep the playhead on the screen
        if ( _follow_playhead )
-               if ( location < leftmost_frame ) 
+               if ( location < leftmost_frame )
                        location = leftmost_frame;
 
        _session->request_locate( location );
@@ -2320,25 +2695,52 @@ Editor::maybe_locate_with_edit_preroll ( framepos_t location )
 void
 Editor::play_with_preroll ()
 {
-       if (selection->time.empty()) {
-               return;
-       } else {
-               framepos_t preroll = get_preroll();
-               
-               framepos_t start = 0;
-               if (selection->time[clicked_selection].start > preroll)
-                       start = selection->time[clicked_selection].start - preroll;
-               
-               framepos_t end = selection->time[clicked_selection].end + preroll;
-               
+       framepos_t start, end;
+       if ( UIConfiguration::instance().get_follow_edits() && get_selection_extents ( start, end) ) {
+               const framepos_t preroll = _session->preroll_samples (start);
+
+               framepos_t ret = start;
+
+               if (start > preroll) {
+                       start = start - preroll;
+               }
+
+               end = end + preroll;  //"post-roll"
+
                AudioRange ar (start, end, 0);
                list<AudioRange> lar;
                lar.push_back (ar);
 
                _session->request_play_range (&lar, true);
+               _session->set_requested_return_frame (ret);  //force auto-return to return to range start, without the preroll
+       } else {
+               framepos_t ph = playhead_cursor->current_frame ();
+               const framepos_t preroll = _session->preroll_samples (ph);
+               framepos_t start;
+               if (ph > preroll) {
+                       start = ph - preroll;
+               } else {
+                       start = 0;
+               }
+               _session->request_locate (start, true);
+               _session->set_requested_return_frame (ph);  //force auto-return to return to playhead location, without the preroll
        }
 }
 
+void
+Editor::rec_with_preroll ()
+{
+       framepos_t ph = playhead_cursor->current_frame ();
+       framepos_t preroll = _session->preroll_samples (ph);
+       _session->request_preroll_record_trim (ph, preroll);
+}
+
+void
+Editor::rec_with_count_in ()
+{
+       _session->request_count_in_record ();
+}
+
 void
 Editor::play_location (Location& location)
 {
@@ -2391,7 +2793,7 @@ Editor::do_layer_operation (LayerOperation op)
                        begin_reversible_command (_("raise region to top"));
                }
                break;
-               
+
        case Lower:
                if (multiple) {
                        begin_reversible_command (_("lower regions"));
@@ -2399,7 +2801,7 @@ Editor::do_layer_operation (LayerOperation op)
                        begin_reversible_command (_("lower region"));
                }
                break;
-               
+
        case LowerToBottom:
                if (multiple) {
                        begin_reversible_command (_("lower regions to bottom"));
@@ -2413,7 +2815,7 @@ Editor::do_layer_operation (LayerOperation op)
        for (set<boost::shared_ptr<Playlist> >::iterator i = playlists.begin(); i != playlists.end(); ++i) {
                (*i)->clear_owned_changes ();
        }
-       
+
        for (RegionSelection::iterator i = selection->regions.begin(); i != selection->regions.end(); ++i) {
                boost::shared_ptr<Region> r = (*i)->region ();
                switch (op) {
@@ -2436,7 +2838,7 @@ Editor::do_layer_operation (LayerOperation op)
                (*i)->rdiff (cmds);
                _session->add_commands (cmds);
        }
-       
+
        commit_reversible_command ();
 }
 
@@ -2487,7 +2889,7 @@ Editor::rename_region ()
                return;
        }
 
-       ArdourDialog d (*this, _("Rename Region"), true, false);
+       ArdourDialog d (_("Rename Region"), true, false);
        Entry entry;
        Label label (_("New name:"));
        HBox hbox;
@@ -2529,25 +2931,6 @@ Editor::rename_region ()
        }
 }
 
-void
-Editor::audition_playlist_region_via_route (boost::shared_ptr<Region> region, Route& route)
-{
-       if (_session->is_auditioning()) {
-               _session->cancel_audition ();
-       }
-
-       // note: some potential for creativity here, because region doesn't
-       // have to belong to the playlist that Route is handling
-
-       // bool was_soloed = route.soloed();
-
-       route.set_solo (true, this);
-
-       _session->request_bounded_roll (region->position(), region->position() + region->length());
-
-       /* XXX how to unset the solo state ? */
-}
-
 /** Start an audition of the first selected region */
 void
 Editor::play_edit_range ()
@@ -2642,8 +3025,14 @@ Editor::create_region_from_selection (vector<boost::shared_ptr<Region> >& new_re
                return;
        }
 
-       framepos_t start = selection->time[clicked_selection].start;
-       framepos_t end = selection->time[clicked_selection].end;
+       framepos_t start, end;
+       if (clicked_selection) {
+               start = selection->time[clicked_selection].start;
+               end = selection->time[clicked_selection].end;
+       } else {
+               start = selection->time.start();
+               end = selection->time.end_frame();
+       }
 
        TrackViewList ts = selection->tracks.filter_to_unique_playlists ();
        sort_track_selection (ts);
@@ -2702,6 +3091,7 @@ static void
 add_if_covered (RegionView* rv, const AudioRange* ar, RegionSelection* rs)
 {
        switch (rv->region()->coverage (ar->start, ar->end - 1)) {
+       // n.b. -1 because AudioRange::end is one past the end, but coverage expects inclusive ranges
        case Evoral::OverlapNone:
                break;
        default:
@@ -2759,62 +3149,63 @@ Editor::separate_regions_between (const TimeSelection& ts)
 
        for (TrackSelection::iterator i = tmptracks.begin(); i != tmptracks.end(); ++i) {
 
-               RouteTimeAxisView* rtv;
+               RouteTimeAxisView* rtv = dynamic_cast<RouteTimeAxisView*> ((*i));
 
-               if ((rtv = dynamic_cast<RouteTimeAxisView*> ((*i))) != 0) {
-
-                       if (rtv->is_track()) {
+               if (!rtv) {
+                       continue;
+               }
 
-                               /* no edits to destructive tracks */
+               if (!rtv->is_track()) {
+                       continue;
+               }
 
-                               if (rtv->track()->destructive()) {
-                                       continue;
-                               }
+               /* no edits to destructive tracks */
 
-                               if ((playlist = rtv->playlist()) != 0) {
+               if (rtv->track()->destructive()) {
+                       continue;
+               }
 
-                                       playlist->clear_changes ();
+               if ((playlist = rtv->playlist()) != 0) {
 
-                                       /* XXX need to consider musical time selections here at some point */
+                       playlist->clear_changes ();
 
-                                       double speed = rtv->track()->speed();
+                       /* XXX need to consider musical time selections here at some point */
 
+                       double speed = rtv->track()->speed();
 
-                                       for (list<AudioRange>::const_iterator t = ts.begin(); t != ts.end(); ++t) {
+                       for (list<AudioRange>::const_iterator t = ts.begin(); t != ts.end(); ++t) {
 
-                                               sigc::connection c = rtv->view()->RegionViewAdded.connect (
-                                                               sigc::mem_fun(*this, &Editor::collect_new_region_view));
+                               sigc::connection c = rtv->view()->RegionViewAdded.connect (
+                                       sigc::mem_fun(*this, &Editor::collect_new_region_view));
 
-                                               latest_regionviews.clear ();
+                               latest_regionviews.clear ();
 
-                                               playlist->partition ((framepos_t)((*t).start * speed),
-                                                               (framepos_t)((*t).end * speed), false);
+                               playlist->partition ((framepos_t)((*t).start * speed),
+                                                    (framepos_t)((*t).end * speed), false);
 
-                                               c.disconnect ();
+                               c.disconnect ();
 
-                                               if (!latest_regionviews.empty()) {
+                               if (!latest_regionviews.empty()) {
 
-                                                       rtv->view()->foreach_regionview (sigc::bind (
-                                                                               sigc::ptr_fun (add_if_covered),
-                                                                               &(*t), &new_selection));
+                                       rtv->view()->foreach_regionview (sigc::bind (
+                                                                                    sigc::ptr_fun (add_if_covered),
+                                                                                    &(*t), &new_selection));
 
-                                                       if (!in_command) {
-                                                               begin_reversible_command (_("separate"));
-                                                               in_command = true;
-                                                       }
+                                       if (!in_command) {
+                                               begin_reversible_command (_("separate"));
+                                               in_command = true;
+                                       }
 
-                                                       /* pick up changes to existing regions */
+                                       /* pick up changes to existing regions */
 
-                                                       vector<Command*> cmds;
-                                                       playlist->rdiff (cmds);
-                                                       _session->add_commands (cmds);
+                                       vector<Command*> cmds;
+                                       playlist->rdiff (cmds);
+                                       _session->add_commands (cmds);
 
-                                                       /* pick up changes to the playlist itself (adds/removes)
-                                                        */
+                                       /* pick up changes to the playlist itself (adds/removes)
+                                        */
 
-                                                       _session->add_command(new StatefulDiffCommand (playlist));
-                                               }
-                                       }
+                                       _session->add_command(new StatefulDiffCommand (playlist));
                                }
                        }
                }
@@ -2828,8 +3219,8 @@ Editor::separate_regions_between (const TimeSelection& ts)
 }
 
 struct PlaylistState {
-    boost::shared_ptr<Playlist> playlist;
-    XMLNode*  before;
+       boost::shared_ptr<Playlist> playlist;
+       XMLNode*  before;
 };
 
 /** Take tracks from get_tracks_for_range_action and cut any regions
@@ -2932,10 +3323,10 @@ Editor::separate_under_selected_regions ()
 
                boost::shared_ptr<Playlist> playlist = (*rl)->playlist();
 
-               if (!playlist) {
+               if (!playlist) {
                        // is this check necessary?
-                       continue;
-               }
+                       continue;
+               }
 
                vector<PlaylistState>::iterator i;
 
@@ -3009,17 +3400,18 @@ Editor::crop_region_to (framepos_t start, framepos_t end)
 
        for (TrackSelection::iterator i = ts.begin(); i != ts.end(); ++i) {
 
-               RouteTimeAxisView* rtv;
+               RouteTimeAxisView* rtv = dynamic_cast<RouteTimeAxisView*> ((*i));
 
-               if ((rtv = dynamic_cast<RouteTimeAxisView*> ((*i))) != 0) {
+               if (!rtv) {
+                       continue;
+               }
 
-                       boost::shared_ptr<Track> t = rtv->track();
+               boost::shared_ptr<Track> t = rtv->track();
 
-                       if (t != 0 && ! t->destructive()) {
+               if (t != 0 && ! t->destructive()) {
 
-                               if ((playlist = rtv->playlist()) != 0) {
-                                       playlists.push_back (playlist);
-                               }
+                       if ((playlist = rtv->playlist()) != 0) {
+                               playlists.push_back (playlist);
                        }
                }
        }
@@ -3028,144 +3420,121 @@ Editor::crop_region_to (framepos_t start, framepos_t end)
                return;
        }
 
-       framepos_t the_start;
-       framepos_t the_end;
-       framepos_t cnt;
-
-       begin_reversible_command (_("trim to selection"));
+       framepos_t pos;
+       framepos_t new_start;
+       framepos_t new_end;
+       framecnt_t new_length;
+       bool in_command = false;
 
        for (vector<boost::shared_ptr<Playlist> >::iterator i = playlists.begin(); i != playlists.end(); ++i) {
 
-               boost::shared_ptr<Region> region;
+               /* Only the top regions at start and end have to be cropped */
+               boost::shared_ptr<Region> region_at_start = (*i)->top_region_at(start);
+               boost::shared_ptr<Region> region_at_end = (*i)->top_region_at(end);
 
-               the_start = start;
+               vector<boost::shared_ptr<Region> > regions;
 
-               if ((region = (*i)->top_region_at(the_start)) == 0) {
-                       continue;
+               if (region_at_start != 0) {
+                       regions.push_back (region_at_start);
+               }
+               if (region_at_end != 0) {
+                       regions.push_back (region_at_end);
                }
 
-               /* now adjust lengths to that we do the right thing
-                  if the selection extends beyond the region
-               */
+               /* now adjust lengths */
+               for (vector<boost::shared_ptr<Region> >::iterator i = regions.begin(); i != regions.end(); ++i) {
 
-               the_start = max (the_start, (framepos_t) region->position());
-               if (max_framepos - the_start < region->length()) {
-                       the_end = the_start + region->length() - 1;
-               } else {
-                       the_end = max_framepos;
-               }
-               the_end = min (end, the_end);
-               cnt = the_end - the_start + 1;
+                       pos = (*i)->position();
+                       new_start = max (start, pos);
+                       if (max_framepos - pos > (*i)->length()) {
+                               new_end = pos + (*i)->length() - 1;
+                       } else {
+                               new_end = max_framepos;
+                       }
+                       new_end = min (end, new_end);
+                       new_length = new_end - new_start + 1;
 
-               region->clear_changes ();
-               region->trim_to (the_start, cnt);
-               _session->add_command (new StatefulDiffCommand (region));
+                       if(!in_command) {
+                               begin_reversible_command (_("trim to selection"));
+                               in_command = true;
+                       }
+                       (*i)->clear_changes ();
+                       (*i)->trim_to (new_start, new_length);
+                       _session->add_command (new StatefulDiffCommand (*i));
+               }
        }
 
-       commit_reversible_command ();
+       if (in_command) {
+               commit_reversible_command ();
+       }
 }
 
 void
 Editor::region_fill_track ()
 {
-       RegionSelection rs = get_regions_from_selection_and_entered ();
+       boost::shared_ptr<Playlist> playlist;
+       RegionSelection regions = get_regions_from_selection_and_entered ();
+       RegionSelection foo;
 
-       if (!_session || rs.empty()) {
+       framepos_t const end = _session->current_end_frame ();
+
+       if (regions.empty () || regions.end_frame () + 1 >= end) {
                return;
        }
 
-       framepos_t const end = _session->current_end_frame ();
+       framepos_t const start_frame = regions.start ();
+       framepos_t const end_frame = regions.end_frame ();
+       framecnt_t const gap = end_frame - start_frame + 1;
 
        begin_reversible_command (Operations::region_fill);
 
-       for (RegionSelection::iterator i = rs.begin(); i != rs.end(); ++i) {
+       selection->clear_regions ();
 
-               boost::shared_ptr<Region> region ((*i)->region());
+       for (RegionSelection::iterator i = regions.begin(); i != regions.end(); ++i) {
 
-               boost::shared_ptr<Playlist> pl = region->playlist();
+               boost::shared_ptr<Region> r ((*i)->region());
 
-               if (end <= region->last_frame()) {
-                       return;
-               }
+               TimeAxisView& tv = (*i)->get_time_axis_view();
+               RouteTimeAxisView* rtv = dynamic_cast<RouteTimeAxisView*> (&tv);
+               latest_regionviews.clear ();
+               sigc::connection c = rtv->view()->RegionViewAdded.connect (sigc::mem_fun(*this, &Editor::collect_new_region_view));
 
-               double times = (double) (end - region->last_frame()) / (double) region->length();
+               framepos_t const position = end_frame + (r->first_frame() - start_frame + 1);
+               playlist = (*i)->region()->playlist();
+               playlist->clear_changes ();
+               playlist->duplicate_until (r, position, gap, end);
+               _session->add_command(new StatefulDiffCommand (playlist));
 
-               if (times == 0) {
-                       return;
-               }
+               c.disconnect ();
+
+               foo.insert (foo.end(), latest_regionviews.begin(), latest_regionviews.end());
+       }
 
-               pl->clear_changes ();
-               pl->add_region (RegionFactory::create (region, true), region->last_frame(), times);
-               _session->add_command (new StatefulDiffCommand (pl));
+       if (!foo.empty()) {
+               selection->set (foo);
        }
 
        commit_reversible_command ();
 }
 
 void
-Editor::region_fill_selection ()
+Editor::set_region_sync_position ()
 {
-       if (clicked_routeview == 0 || !clicked_routeview->is_audio_track()) {
-               return;
-       }
+       set_sync_point (get_preferred_edit_position (), get_regions_from_selection_and_edit_point ());
+}
 
-       if (selection->time.empty()) {
-               return;
-       }
+void
+Editor::set_sync_point (framepos_t where, const RegionSelection& rs)
+{
+       bool in_command = false;
 
-       boost::shared_ptr<Region> region = _regions->get_single_selection ();
-       if (region == 0) {
-               return;
-       }
+       for (RegionSelection::const_iterator r = rs.begin(); r != rs.end(); ++r) {
 
-       framepos_t start = selection->time[clicked_selection].start;
-       framepos_t end = selection->time[clicked_selection].end;
+               if (!(*r)->region()->covers (where)) {
+                       continue;
+               }
 
-       boost::shared_ptr<Playlist> playlist;
-
-       if (selection->tracks.empty()) {
-               return;
-       }
-
-       framepos_t selection_length = end - start;
-       float times = (float)selection_length / region->length();
-
-       begin_reversible_command (Operations::fill_selection);
-
-       TrackViewList ts = selection->tracks.filter_to_unique_playlists ();
-
-       for (TrackViewList::iterator i = ts.begin(); i != ts.end(); ++i) {
-
-               if ((playlist = (*i)->playlist()) == 0) {
-                       continue;
-               }
-
-               playlist->clear_changes ();
-               playlist->add_region (RegionFactory::create (region, true), start, times);
-               _session->add_command (new StatefulDiffCommand (playlist));
-       }
-
-       commit_reversible_command ();
-}
-
-void
-Editor::set_region_sync_position ()
-{
-       set_sync_point (get_preferred_edit_position (), get_regions_from_selection_and_edit_point ());
-}
-
-void
-Editor::set_sync_point (framepos_t where, const RegionSelection& rs)
-{
-       bool in_command = false;
-
-       for (RegionSelection::const_iterator r = rs.begin(); r != rs.end(); ++r) {
-
-               if (!(*r)->region()->covers (where)) {
-                       continue;
-               }
-
-               boost::shared_ptr<Region> region ((*r)->region());
+               boost::shared_ptr<Region> region ((*r)->region());
 
                if (!in_command) {
                        begin_reversible_command (_("set sync point"));
@@ -3249,9 +3618,9 @@ Editor::align_regions (RegionPoint what)
 }
 
 struct RegionSortByTime {
-    bool operator() (const RegionView* a, const RegionView* b) {
-           return a->region()->position() < b->region()->position();
-    }
+       bool operator() (const RegionView* a, const RegionView* b) {
+               return a->region()->position() < b->region()->position();
+       }
 };
 
 void
@@ -3405,10 +3774,8 @@ Editor::trim_region (bool front)
 
                        if (front) {
                                (*i)->region()->trim_front (where);
-                               maybe_locate_with_edit_preroll ( where );
                        } else {
                                (*i)->region()->trim_end (where);
-                               maybe_locate_with_edit_preroll ( where );
                        }
 
                        _session->add_command (new StatefulDiffCommand ((*i)->region()));
@@ -3443,8 +3810,7 @@ void
 Editor::trim_region_to_location (const Location& loc, const char* str)
 {
        RegionSelection rs = get_regions_from_selection_and_entered ();
-
-       begin_reversible_command (str);
+       bool in_command = false;
 
        for (RegionSelection::iterator x = rs.begin(); x != rs.end(); ++x) {
                RegionView* rv = (*x);
@@ -3475,10 +3841,17 @@ Editor::trim_region_to_location (const Location& loc, const char* str)
 
                rv->region()->clear_changes ();
                rv->region()->trim_to (start, (end - start));
+
+               if (!in_command) {
+                       begin_reversible_command (str);
+                       in_command = true;
+               }
                _session->add_command(new StatefulDiffCommand (rv->region()));
        }
 
-       commit_reversible_command ();
+       if (in_command) {
+               commit_reversible_command ();
+       }
 }
 
 void
@@ -3497,8 +3870,7 @@ void
 Editor::trim_to_region(bool forward)
 {
        RegionSelection rs = get_regions_from_selection_and_entered ();
-
-       begin_reversible_command (_("trim to region"));
+       bool in_command = false;
 
        boost::shared_ptr<Region> next_region;
 
@@ -3513,7 +3885,7 @@ Editor::trim_to_region(bool forward)
                AudioTimeAxisView* atav = dynamic_cast<AudioTimeAxisView*> (&arv->get_time_axis_view());
 
                if (!atav) {
-                       return;
+                       continue;
                }
 
                float speed = 1.0;
@@ -3530,32 +3902,38 @@ Editor::trim_to_region(bool forward)
 
                if (forward) {
 
-                   next_region = playlist->find_next_region (region->first_frame(), Start, 1);
+                       next_region = playlist->find_next_region (region->first_frame(), Start, 1);
 
-                   if (!next_region) {
-                       continue;
-                   }
+                       if (!next_region) {
+                               continue;
+                       }
 
-                   region->trim_end((framepos_t) ( (next_region->first_frame() - 1) * speed));
-                   arv->region_changed (PropertyChange (ARDOUR::Properties::length));
+                       region->trim_end((framepos_t) ( (next_region->first_frame() - 1) * speed));
+                       arv->region_changed (PropertyChange (ARDOUR::Properties::length));
                }
                else {
 
-                   next_region = playlist->find_next_region (region->first_frame(), Start, 0);
+                       next_region = playlist->find_next_region (region->first_frame(), Start, 0);
 
-                   if(!next_region){
-                       continue;
-                   }
+                       if(!next_region){
+                               continue;
+                       }
 
-                   region->trim_front((framepos_t) ((next_region->last_frame() + 1) * speed));
+                       region->trim_front((framepos_t) ((next_region->last_frame() + 1) * speed));
 
-                   arv->region_changed (ARDOUR::bounds_change);
+                       arv->region_changed (ARDOUR::bounds_change);
                }
 
+               if (!in_command) {
+                       begin_reversible_command (_("trim to region"));
+                       in_command = true;
+               }
                _session->add_command(new StatefulDiffCommand (region));
        }
 
-       commit_reversible_command ();
+       if (in_command) {
+               commit_reversible_command ();
+       }
 }
 
 void
@@ -3595,7 +3973,7 @@ Editor::freeze_route ()
        /* stop transport before we start. this is important */
 
        _session->request_transport_speed (0.0);
-       
+
        /* wait for just a little while, because the above call is asynchronous */
 
        Glib::usleep (250000);
@@ -3616,8 +3994,8 @@ Editor::freeze_route ()
 
        if (clicked_routeview->track()->has_external_redirects()) {
                MessageDialog d (string_compose (_("<b>%1</b>\n\nThis track has at least one send/insert/return as part of its signal flow.\n\n"
-                                                  "Freezing will only process the signal as far as the first send/insert/return."),
-                                                clicked_routeview->track()->name()), true, MESSAGE_INFO, BUTTONS_NONE, true);
+                                                  "Freezing will only process the signal as far as the first send/insert/return."),
+                                                clicked_routeview->track()->name()), true, MESSAGE_INFO, BUTTONS_NONE, true);
 
                d.add_button (_("Freeze anyway"), Gtk::RESPONSE_OK);
                d.add_button (_("Don't freeze"), Gtk::RESPONSE_CANCEL);
@@ -3640,14 +4018,14 @@ Editor::freeze_route ()
 
        pthread_create_and_store (X_("freezer"), &itt.thread, _freeze_thread, this);
 
-       set_canvas_cursor (_cursors->wait);
+       CursorContext::Handle cursor_ctx = CursorContext::create(*this, _cursors->wait);
 
        while (!itt.done && !itt.cancel) {
                gtk_main_iteration ();
        }
 
+       pthread_join (itt.thread, 0);
        current_interthread_info = 0;
-       set_canvas_cursor (current_canvas_cursor);
 }
 
 void
@@ -3681,21 +4059,20 @@ Editor::bounce_range_selection (bool replace, bool enable_processing)
        framepos_t start = selection->time[clicked_selection].start;
        framepos_t end = selection->time[clicked_selection].end;
        framepos_t cnt = end - start + 1;
-
-       begin_reversible_command (_("bounce range"));
+       bool in_command = false;
 
        for (TrackViewList::iterator i = views.begin(); i != views.end(); ++i) {
 
-               RouteTimeAxisView* rtv;
+               RouteTimeAxisView* rtv = dynamic_cast<RouteTimeAxisView*> (*i);
 
-               if ((rtv = dynamic_cast<RouteTimeAxisView*> (*i)) == 0) {
+               if (!rtv) {
                        continue;
                }
 
                boost::shared_ptr<Playlist> playlist;
 
                if ((playlist = rtv->playlist()) == 0) {
-                       return;
+                       continue;
                }
 
                InterThreadInfo itt;
@@ -3722,6 +4099,10 @@ Editor::bounce_range_selection (bool replace, bool enable_processing)
                        playlist->add_region (r, start);
                }
 
+               if (!in_command) {
+                       begin_reversible_command (_("bounce range"));
+                       in_command = true;
+               }
                vector<Command*> cmds;
                playlist->rdiff (cmds);
                _session->add_commands (cmds);
@@ -3729,7 +4110,9 @@ Editor::bounce_range_selection (bool replace, bool enable_processing)
                _session->add_command (new StatefulDiffCommand (playlist));
        }
 
-       commit_reversible_command ();
+       if (in_command) {
+               commit_reversible_command ();
+       }
 }
 
 /** Delete selected regions, automation points or a time range */
@@ -3809,8 +4192,9 @@ Editor::cut_copy (CutCopyOp op)
                }
        }
 
-       if ( op != Delete )  //"Delete" doesn't change copy/paste buf
+       if ( op != Delete ) { //"Delete" doesn't change copy/paste buf
                cut_buffer->clear ();
+       }
 
        if (entered_marker) {
 
@@ -3820,6 +4204,7 @@ Editor::cut_copy (CutCopyOp op)
                Location* loc = find_location_from_marker (entered_marker, ignored);
 
                if (_session && loc) {
+                       entered_marker = NULL;
                        Glib::signal_idle().connect (sigc::bind (sigc::mem_fun(*this, &Editor::really_remove_marker), loc));
                }
 
@@ -3827,57 +4212,34 @@ Editor::cut_copy (CutCopyOp op)
                return;
        }
 
-       if (internal_editing()) {
-
-               switch (effective_mouse_mode()) {
-               case MouseObject:
-               case MouseRange:
-                       begin_reversible_command (opname + ' ' + X_("MIDI"));
-                       cut_copy_midi (op);
-                       commit_reversible_command ();
-                       break;
-               default:
-                       break;
-               }
-
+       switch (mouse_mode) {
+       case MouseDraw:
+       case MouseContent:
+               begin_reversible_command (opname + ' ' + X_("MIDI"));
+               cut_copy_midi (op);
+               commit_reversible_command ();
                return;
+       default:
+               break;
        }
 
        bool did_edit = false;
 
-       if (!selection->points.empty()) {
-               begin_reversible_command (opname + _(" points"));
-               did_edit = true;
-               cut_copy_points (op);
-               if (op == Cut || op == Delete) {
-                       selection->clear_points ();
-               }
-       } else if (!selection->regions.empty() || !selection->points.empty()) {
-
-               string thing_name;
-
-               if (selection->regions.empty()) {
-                       thing_name = _("points");
-               } else if (selection->points.empty()) {
-                       thing_name = _("regions");
-               } else {
-                       thing_name = _("objects");
-               }
-       
-               begin_reversible_command (opname + ' ' + thing_name);
+       if (!selection->regions.empty() || !selection->points.empty()) {
+               begin_reversible_command (opname + ' ' + _("objects"));
                did_edit = true;
 
                if (!selection->regions.empty()) {
                        cut_copy_regions (op, selection->regions);
-                       
+
                        if (op == Cut || op == Delete) {
                                selection->clear_regions ();
                        }
                }
-               
+
                if (!selection->points.empty()) {
                        cut_copy_points (op);
-                       
+
                        if (op == Cut || op == Delete) {
                                selection->clear_points ();
                        }
@@ -3891,38 +4253,49 @@ Editor::cut_copy (CutCopyOp op)
                        selection->set (start, end);
                }
        } else if (!selection->time.empty()) {
-               begin_reversible_command (opname + _(" range"));
+               begin_reversible_command (opname + ' ' + _("range"));
 
                did_edit = true;
                cut_copy_ranges (op);
-               
+
                if (op == Cut || op == Delete) {
                        selection->clear_time ();
                }
        }
-       
+
        if (did_edit) {
-               commit_reversible_command ();   
+               /* reset repeated paste state */
+               paste_count    = 0;
+               last_paste_pos = 0;
+               commit_reversible_command ();
        }
-       
+
        if (op == Delete || op == Cut || op == Clear) {
                _drags->abort ();
        }
 }
 
+
 struct AutomationRecord {
-       AutomationRecord () : state (0) {}
-       AutomationRecord (XMLNode* s) : state (s) {}
-       
+       AutomationRecord () : state (0) , line(NULL) {}
+       AutomationRecord (XMLNode* s, const AutomationLine* l) : state (s) , line (l) {}
+
        XMLNode* state; ///< state before any operation
+       const AutomationLine* line; ///< line this came from
        boost::shared_ptr<Evoral::ControlList> copy; ///< copied events for the cut buffer
 };
 
+struct PointsSelectionPositionSorter {
+       bool operator() (ControlPoint* a, ControlPoint* b) {
+               return (*(a->model()))->when < (*(b->model()))->when;
+       }
+};
+
 /** Cut, copy or clear selected automation points.
  *  @param op Operation (Cut, Copy or Clear)
  */
 void
-Editor::cut_copy_points (CutCopyOp op)
+Editor::cut_copy_points (Editing::CutCopyOp op, Evoral::Beats earliest, bool midi)
 {
        if (selection->points.empty ()) {
                return;
@@ -3935,14 +4308,18 @@ Editor::cut_copy_points (CutCopyOp op)
        typedef std::map<boost::shared_ptr<AutomationList>, AutomationRecord> Lists;
        Lists lists;
 
+       /* user could select points in any order */
+       selection->points.sort(PointsSelectionPositionSorter ());
+
        /* Go through all selected points, making an AutomationRecord for each distinct AutomationList */
-       for (PointSelection::iterator i = selection->points.begin(); i != selection->points.end(); ++i) {
-               boost::shared_ptr<AutomationList> al = (*i)->line().the_list();
+       for (PointSelection::iterator sel_point = selection->points.begin(); sel_point != selection->points.end(); ++sel_point) {
+               const AutomationLine&                   line = (*sel_point)->line();
+               const boost::shared_ptr<AutomationList> al   = line.the_list();
                if (lists.find (al) == lists.end ()) {
                        /* We haven't seen this list yet, so make a record for it.  This includes
                           taking a copy of its current state, in case this is needed for undo later.
                        */
-                       lists[al] = AutomationRecord (&al->get_state ());
+                       lists[al] = AutomationRecord (&al->get_state (), &line);
                }
        }
 
@@ -3951,39 +4328,78 @@ Editor::cut_copy_points (CutCopyOp op)
                   ControlList for each of our source lists to put the cut buffer data in.
                */
                for (Lists::iterator i = lists.begin(); i != lists.end(); ++i) {
-                       i->second.copy = i->first->create (i->first->parameter ());
+                       i->second.copy = i->first->create (i->first->parameter (), i->first->descriptor());
                }
 
                /* Add all selected points to the relevant copy ControlLists */
-               for (PointSelection::iterator i = selection->points.begin(); i != selection->points.end(); ++i) {
-                       boost::shared_ptr<AutomationList> al = (*i)->line().the_list();
-                       AutomationList::const_iterator j = (*i)->model ();
-                       lists[al].copy->add ((*j)->when, (*j)->value);
+               MusicFrame start (std::numeric_limits<framepos_t>::max(), 0);
+               for (PointSelection::iterator sel_point = selection->points.begin(); sel_point != selection->points.end(); ++sel_point) {
+                       boost::shared_ptr<AutomationList>    al = (*sel_point)->line().the_list();
+                       AutomationList::const_iterator ctrl_evt = (*sel_point)->model ();
+
+                       lists[al].copy->fast_simple_add ((*ctrl_evt)->when, (*ctrl_evt)->value);
+                       if (midi) {
+                               /* Update earliest MIDI start time in beats */
+                               earliest = std::min(earliest, Evoral::Beats((*ctrl_evt)->when));
+                       } else {
+                               /* Update earliest session start time in frames */
+                               start.frame = std::min(start.frame, (*sel_point)->line().session_position(ctrl_evt));
+                       }
+               }
+
+               /* Snap start time backwards, so copy/paste is snap aligned. */
+               if (midi) {
+                       if (earliest == Evoral::Beats::max()) {
+                               earliest = Evoral::Beats();  // Weird... don't offset
+                       }
+                       earliest.round_down_to_beat();
+               } else {
+                       if (start.frame == std::numeric_limits<double>::max()) {
+                               start.frame = 0;  // Weird... don't offset
+                       }
+                       snap_to(start, RoundDownMaybe);
                }
 
+               const double line_offset = midi ? earliest.to_double() : start.frame;
                for (Lists::iterator i = lists.begin(); i != lists.end(); ++i) {
-                       /* Correct this copy list so that it starts at time 0 */
-                       double const start = i->second.copy->front()->when;
-                       for (AutomationList::iterator j = i->second.copy->begin(); j != i->second.copy->end(); ++j) {
-                               (*j)->when -= start;
+                       /* Correct this copy list so that it is relative to the earliest
+                          start time, so relative ordering between points is preserved
+                          when copying from several lists and the paste starts at the
+                          earliest copied piece of data. */
+                       boost::shared_ptr<Evoral::ControlList> &al_cpy = i->second.copy;
+                       for (AutomationList::iterator ctrl_evt = al_cpy->begin(); ctrl_evt != al_cpy->end(); ++ctrl_evt) {
+                               (*ctrl_evt)->when -= line_offset;
                        }
 
                        /* And add it to the cut buffer */
-                       cut_buffer->add (i->second.copy);
+                       cut_buffer->add (al_cpy);
                }
        }
-               
+
        if (op == Delete || op == Cut) {
                /* This operation needs to remove things from the main AutomationList, so do that now */
-               
+
                for (Lists::iterator i = lists.begin(); i != lists.end(); ++i) {
                        i->first->freeze ();
                }
 
                /* Remove each selected point from its AutomationList */
-               for (PointSelection::iterator i = selection->points.begin(); i != selection->points.end(); ++i) {
-                       boost::shared_ptr<AutomationList> al = (*i)->line().the_list();
-                       al->erase ((*i)->model ());
+               for (PointSelection::iterator sel_point = selection->points.begin(); sel_point != selection->points.end(); ++sel_point) {
+                       AutomationLine& line = (*sel_point)->line ();
+                       boost::shared_ptr<AutomationList> al = line.the_list();
+
+                       bool erase = true;
+
+                       if (dynamic_cast<AudioRegionGainLine*> (&line)) {
+                               /* removing of first and last gain point in region gain lines is prohibited*/
+                               if (line.is_last_point (*(*sel_point)) || line.is_first_point (*(*sel_point))) {
+                                       erase = false;
+                               }
+                       }
+
+                       if(erase) {
+                               al->erase ((*sel_point)->model ());
+                       }
                }
 
                /* Thaw the lists and add undo records for them */
@@ -4001,25 +4417,39 @@ Editor::cut_copy_points (CutCopyOp op)
 void
 Editor::cut_copy_midi (CutCopyOp op)
 {
+       Evoral::Beats earliest = Evoral::Beats::max();
        for (MidiRegionSelection::iterator i = selection->midi_regions.begin(); i != selection->midi_regions.end(); ++i) {
-               MidiRegionView* mrv = *i;
-               mrv->cut_copy_clear (op);
-       }
-}
+               MidiRegionView* mrv = dynamic_cast<MidiRegionView*>(*i);
+               if (mrv) {
+                       if (!mrv->selection().empty()) {
+                               earliest = std::min(earliest, (*mrv->selection().begin())->note()->time());
+                       }
+                       mrv->cut_copy_clear (op);
 
+                       /* XXX: not ideal, as there may be more than one track involved in the selection */
+                       _last_cut_copy_source_track = &mrv->get_time_axis_view();
+               }
+       }
 
+       if (!selection->points.empty()) {
+               cut_copy_points (op, earliest, true);
+               if (op == Cut || op == Delete) {
+                       selection->clear_points ();
+               }
+       }
+}
 
 struct lt_playlist {
-    bool operator () (const PlaylistState& a, const PlaylistState& b) {
-           return a.playlist < b.playlist;
-    }
+       bool operator () (const PlaylistState& a, const PlaylistState& b) {
+               return a.playlist < b.playlist;
+       }
 };
 
 struct PlaylistMapping {
-    TimeAxisView* tv;
-    boost::shared_ptr<Playlist> pl;
+       TimeAxisView* tv;
+       boost::shared_ptr<Playlist> pl;
 
-    PlaylistMapping (TimeAxisView* tvp) : tv (tvp) {}
+       PlaylistMapping (TimeAxisView* tvp) : tv (tvp) {}
 };
 
 /** Remove `clicked_regionview' */
@@ -4030,6 +4460,8 @@ Editor::remove_clicked_region ()
                return;
        }
 
+       begin_reversible_command (_("remove region"));
+
        boost::shared_ptr<Playlist> playlist = clicked_routeview->playlist();
 
        playlist->clear_changes ();
@@ -4044,7 +4476,7 @@ Editor::remove_clicked_region ()
        vector<Command*> cmds;
        playlist->rdiff (cmds);
        _session->add_commands (cmds);
-       
+
        _session->add_command(new StatefulDiffCommand (playlist));
        commit_reversible_command ();
 }
@@ -4060,8 +4492,6 @@ Editor::remove_selected_regions ()
                return;
        }
 
-       begin_reversible_command (_("remove region"));
-
        list<boost::shared_ptr<Region> > regions_to_remove;
 
        for (RegionSelection::iterator i = rs.begin(); i != rs.end(); ++i) {
@@ -4083,10 +4513,10 @@ Editor::remove_selected_regions ()
 
                boost::shared_ptr<Playlist> playlist = (*rl)->playlist();
 
-               if (!playlist) {
+               if (!playlist) {
                        // is this check necessary?
-                       continue;
-               }
+                       continue;
+               }
 
                /* get_regions_from_selection_and_entered() guarantees that
                   the playlists involved are unique, so there is no need
@@ -4105,6 +4535,7 @@ Editor::remove_selected_regions ()
        }
 
        vector<boost::shared_ptr<Playlist> >::iterator pl;
+       bool in_command = false;
 
        for (pl = playlists.begin(); pl != playlists.end(); ++pl) {
                (*pl)->thaw ();
@@ -4112,14 +4543,21 @@ Editor::remove_selected_regions ()
                /* We might have removed regions, which alters other regions' layering_index,
                   so we need to do a recursive diff here.
                */
+
+               if (!in_command) {
+                       begin_reversible_command (_("remove region"));
+                       in_command = true;
+               }
                vector<Command*> cmds;
                (*pl)->rdiff (cmds);
                _session->add_commands (cmds);
-               
+
                _session->add_command(new StatefulDiffCommand (*pl));
        }
 
-       commit_reversible_command ();
+       if (in_command) {
+               commit_reversible_command ();
+       }
 }
 
 /** Cut, copy or clear selected regions.
@@ -4205,15 +4643,15 @@ Editor::cut_copy_regions (CutCopyOp op, RegionSelection& rs)
                if (op != Delete) {
 
                        vector<PlaylistMapping>::iterator z;
-                       
+
                        for (z = pmap.begin(); z != pmap.end(); ++z) {
                                if ((*z).tv == &tv) {
                                        break;
                                }
                        }
-                       
+
                        assert (z != pmap.end());
-                       
+
                        if (!(*z).pl) {
                                npl = PlaylistFactory::create (pl->data_type(), *_session, "cutlist", true);
                                npl->freeze();
@@ -4234,7 +4672,7 @@ Editor::cut_copy_regions (CutCopyOp op, RegionSelection& rs)
                        if (Config->get_edit_mode() == Ripple)
                                pl->ripple (r->position(), -r->length(), boost::shared_ptr<Region>());
                        break;
-                       
+
                case Cut:
                        _xx = RegionFactory::create (r);
                        npl->add_region (_xx, r->position() - first_position);
@@ -4261,20 +4699,20 @@ Editor::cut_copy_regions (CutCopyOp op, RegionSelection& rs)
        if (op != Delete) {
 
                list<boost::shared_ptr<Playlist> > foo;
-               
-               /* the pmap is in the same order as the tracks in which selected regions occured */
-               
+
+               /* the pmap is in the same order as the tracks in which selected regions occurred */
+
                for (vector<PlaylistMapping>::iterator i = pmap.begin(); i != pmap.end(); ++i) {
                        if ((*i).pl) {
                                (*i).pl->thaw();
                                foo.push_back ((*i).pl);
                        }
                }
-               
+
                if (!foo.empty()) {
                        cut_buffer->set (foo);
                }
-               
+
                if (pmap.empty()) {
                        _last_cut_copy_source_track = 0;
                } else {
@@ -4291,7 +4729,7 @@ Editor::cut_copy_regions (CutCopyOp op, RegionSelection& rs)
                vector<Command*> cmds;
                (*pl)->rdiff (cmds);
                _session->add_commands (cmds);
-               
+
                _session->add_command (new StatefulDiffCommand (*pl));
        }
 }
@@ -4314,7 +4752,7 @@ Editor::cut_copy_ranges (CutCopyOp op)
                        return;
                }
                ts.push_back (entered_track);
-       } 
+       }
 
        for (TrackViewList::iterator i = ts.begin(); i != ts.end(); ++i) {
                (*i)->cut_copy_clear (*selection, op);
@@ -4324,110 +4762,154 @@ Editor::cut_copy_ranges (CutCopyOp op)
 void
 Editor::paste (float times, bool from_context)
 {
-        DEBUG_TRACE (DEBUG::CutNPaste, "paste to preferred edit pos\n");
-
-       paste_internal (get_preferred_edit_position (false, from_context), times);
+       DEBUG_TRACE (DEBUG::CutNPaste, "paste to preferred edit pos\n");
+       MusicFrame where (get_preferred_edit_position (EDIT_IGNORE_NONE, from_context), 0);
+       paste_internal (where.frame, times, 0);
 }
 
 void
 Editor::mouse_paste ()
 {
-       framepos_t where;
+       MusicFrame where (0, 0);
        bool ignored;
-
-       if (!mouse_frame (where, ignored)) {
+       if (!mouse_frame (where.frame, ignored)) {
                return;
        }
 
        snap_to (where);
-       paste_internal (where, 1);
+       paste_internal (where.frame, 1, where.division);
 }
 
 void
-Editor::paste_internal (framepos_t position, float times)
+Editor::paste_internal (framepos_t position, float times, const int32_t sub_num)
 {
-        DEBUG_TRACE (DEBUG::CutNPaste, string_compose ("apparent paste position is %1\n", position));
+       DEBUG_TRACE (DEBUG::CutNPaste, string_compose ("apparent paste position is %1\n", position));
 
-       if (internal_editing()) {
-               if (cut_buffer->midi_notes.empty()) {
-                       return;
-               }
-       } else {
-               if (cut_buffer->empty()) {
-                       return;
-               }
+       if (cut_buffer->empty(internal_editing())) {
+               return;
        }
 
        if (position == max_framepos) {
                position = get_preferred_edit_position();
-                DEBUG_TRACE (DEBUG::CutNPaste, string_compose ("preferred edit position is %1\n", position));
+               DEBUG_TRACE (DEBUG::CutNPaste, string_compose ("preferred edit position is %1\n", position));
        }
 
-       TrackViewList ts;
-       TrackViewList::iterator i;
-       size_t nth;
+       if (position == last_paste_pos) {
+               /* repeated paste in the same position */
+               ++paste_count;
+       } else {
+               /* paste in new location, reset repeated paste state */
+               paste_count = 0;
+               last_paste_pos = position;
+       }
 
        /* get everything in the correct order */
 
-       if (_edit_point == Editing::EditAtMouse && entered_track) {
-               /* With the mouse edit point, paste onto the track under the mouse */
-               ts.push_back (entered_track);
-       } else if (!selection->tracks.empty()) {
-               /* Otherwise, if there are some selected tracks, paste to them */
+       TrackViewList ts;
+       if (!selection->tracks.empty()) {
+               /* If there is a track selection, paste into exactly those tracks and
+                * only those tracks.  This allows the user to be explicit and override
+                * the below "do the reasonable thing" logic. */
                ts = selection->tracks.filter_to_unique_playlists ();
                sort_track_selection (ts);
-       } else if (_last_cut_copy_source_track) {
-               /* Otherwise paste to the track that the cut/copy came from;
-                  see discussion in mantis #3333.
-               */
-               ts.push_back (_last_cut_copy_source_track);
-       }
-
-       if (internal_editing ()) {
+       } else {
+               /* Figure out which track to base the paste at. */
+               TimeAxisView* base_track = NULL;
+               if (_edit_point == Editing::EditAtMouse && entered_track) {
+                       /* With the mouse edit point, paste onto the track under the mouse. */
+                       base_track = entered_track;
+               } else if (_edit_point == Editing::EditAtMouse && entered_regionview) {
+                       /* With the mouse edit point, paste onto the track of the region under the mouse. */
+                       base_track = &entered_regionview->get_time_axis_view();
+               } else if (_last_cut_copy_source_track) {
+                       /* Paste to the track that the cut/copy came from (see mantis #333). */
+                       base_track = _last_cut_copy_source_track;
+               } else {
+                       /* This is "impossible" since we've copied... well, do nothing. */
+                       return;
+               }
 
-               /* undo/redo is handled by individual tracks/regions */
+               /* Walk up to parent if necessary, so base track is a route. */
+               while (base_track->get_parent()) {
+                       base_track = base_track->get_parent();
+               }
 
-               for (nth = 0, i = ts.begin(); i != ts.end(); ++i, ++nth) {
+               /* Add base track and all tracks below it.  The paste logic will select
+                  the appropriate object types from the cut buffer in relative order. */
+               for (TrackViewList::iterator i = track_views.begin(); i != track_views.end(); ++i) {
+                       if ((*i)->order() >= base_track->order()) {
+                               ts.push_back(*i);
+                       }
+               }
 
-                       RegionSelection rs;
-                       RegionSelection::iterator r;
-                       MidiNoteSelection::iterator cb;
+               /* Sort tracks so the nth track of type T will pick the nth object of type T. */
+               sort_track_selection (ts);
 
-                       get_regions_at (rs, position, ts);
+               /* Add automation children of each track in order, for pasting several lines. */
+               for (TrackViewList::iterator i = ts.begin(); i != ts.end();) {
+                       /* Add any automation children for pasting several lines */
+                       RouteTimeAxisView* rtv = dynamic_cast<RouteTimeAxisView*>(*i++);
+                       if (!rtv) {
+                               continue;
+                       }
 
-                       for (cb = cut_buffer->midi_notes.begin(), r = rs.begin();
-                            cb != cut_buffer->midi_notes.end() && r != rs.end(); ++r) {
-                               MidiRegionView* mrv = dynamic_cast<MidiRegionView*> (*r);
-                               if (mrv) {
-                                       mrv->paste (position, times, **cb);
-                                       ++cb;
-                               }
+                       typedef RouteTimeAxisView::AutomationTracks ATracks;
+                       const ATracks& atracks = rtv->automation_tracks();
+                       for (ATracks::const_iterator a = atracks.begin(); a != atracks.end(); ++a) {
+                               i = ts.insert(i, a->second.get());
+                               ++i;
                        }
                }
 
-       } else {
+               /* We now have a list of trackviews starting at base_track, including
+                  automation children, in the order shown in the editor, e.g. R1,
+                  R1.A1, R1.A2, R2, R2.A1, ... */
+       }
 
-               /* we do redo (do you do voodoo?) */
+       begin_reversible_command (Operations::paste);
 
-               begin_reversible_command (Operations::paste);
+       if (ts.size() == 1 && cut_buffer->lines.size() == 1 &&
+           dynamic_cast<AutomationTimeAxisView*>(ts.front())) {
+           /* Only one line copied, and one automation track selected.  Do a
+              "greedy" paste from one automation type to another. */
 
-               for (nth = 0, i = ts.begin(); i != ts.end(); ++i, ++nth) {
-                       (*i)->paste (position, times, *cut_buffer, nth);
-               }
+               PasteContext ctx(paste_count, times, ItemCounts(), true);
+               ts.front()->paste (position, *cut_buffer, ctx, sub_num);
 
-               commit_reversible_command ();
+       } else {
+
+               /* Paste into tracks */
+
+               PasteContext ctx(paste_count, times, ItemCounts(), false);
+               for (TrackViewList::iterator i = ts.begin(); i != ts.end(); ++i) {
+                       (*i)->paste (position, *cut_buffer, ctx, sub_num);
+               }
        }
+
+       commit_reversible_command ();
+}
+
+void
+Editor::duplicate_regions (float times)
+{
+       RegionSelection rs (get_regions_from_selection_and_entered());
+       duplicate_some_regions (rs, times);
 }
 
 void
 Editor::duplicate_some_regions (RegionSelection& regions, float times)
 {
+       if (regions.empty ()) {
+               return;
+       }
+
        boost::shared_ptr<Playlist> playlist;
        RegionSelection sel = regions; // clear (below) may  clear the argument list if its the current region selection
        RegionSelection foo;
 
        framepos_t const start_frame = regions.start ();
        framepos_t const end_frame = regions.end_frame ();
+       framecnt_t const gap = end_frame - start_frame + 1;
 
        begin_reversible_command (Operations::duplicate_region);
 
@@ -4442,9 +4924,10 @@ Editor::duplicate_some_regions (RegionSelection& regions, float times)
                latest_regionviews.clear ();
                sigc::connection c = rtv->view()->RegionViewAdded.connect (sigc::mem_fun(*this, &Editor::collect_new_region_view));
 
-               playlist = (*i)->region()->playlist();
+               framepos_t const position = end_frame + (r->first_frame() - start_frame + 1);
+               playlist = (*i)->region()->playlist();
                playlist->clear_changes ();
-               playlist->duplicate (r, end_frame + (r->first_frame() - start_frame), times);
+               playlist->duplicate (r, position, gap, times);
                _session->add_command(new StatefulDiffCommand (playlist));
 
                c.disconnect ();
@@ -4452,11 +4935,11 @@ Editor::duplicate_some_regions (RegionSelection& regions, float times)
                foo.insert (foo.end(), latest_regionviews.begin(), latest_regionviews.end());
        }
 
-       commit_reversible_command ();
-
        if (!foo.empty()) {
                selection->set (foo);
        }
+
+       commit_reversible_command ();
 }
 
 void
@@ -4467,36 +4950,47 @@ Editor::duplicate_selection (float times)
        }
 
        boost::shared_ptr<Playlist> playlist;
-       vector<boost::shared_ptr<Region> > new_regions;
-       vector<boost::shared_ptr<Region> >::iterator ri;
-
-       create_region_from_selection (new_regions);
-
-       if (new_regions.empty()) {
-               return;
-       }
-
-       begin_reversible_command (_("duplicate selection"));
-
-       ri = new_regions.begin();
 
        TrackViewList ts = selection->tracks.filter_to_unique_playlists ();
 
+       bool in_command = false;
+
        for (TrackViewList::iterator i = ts.begin(); i != ts.end(); ++i) {
                if ((playlist = (*i)->playlist()) == 0) {
                        continue;
                }
                playlist->clear_changes ();
-               playlist->duplicate (*ri, selection->time[clicked_selection].end, times);
-               _session->add_command (new StatefulDiffCommand (playlist));
 
-               ++ri;
-               if (ri == new_regions.end()) {
-                       --ri;
+               if (clicked_selection) {
+                       playlist->duplicate_range (selection->time[clicked_selection], times);
+               } else {
+                       playlist->duplicate_ranges (selection->time, times);
                }
+
+               if (!in_command) {
+                       begin_reversible_command (_("duplicate range selection"));
+                       in_command = true;
+               }
+               _session->add_command (new StatefulDiffCommand (playlist));
+
        }
 
-       commit_reversible_command ();
+       if (in_command) {
+               if (times == 1.0f) {
+                       // now "move" range selection to after the current range selection
+                       framecnt_t distance = 0;
+
+                       if (clicked_selection) {
+                               distance =
+                                   selection->time[clicked_selection].end - selection->time[clicked_selection].start;
+                       } else {
+                               distance = selection->time.end_frame () - selection->time.start ();
+                       }
+
+                       selection->move_time (distance);
+               }
+               commit_reversible_command ();
+       }
 }
 
 /** Reset all selected points to the relevant default value */
@@ -4505,7 +4999,7 @@ Editor::reset_point_selection ()
 {
        for (PointSelection::iterator i = selection->points.begin(); i != selection->points.end(); ++i) {
                ARDOUR::AutomationList::iterator j = (*i)->model ();
-               (*j)->value = (*i)->line().the_list()->default_value ();
+               (*j)->value = (*i)->line().the_list()->descriptor ().normal;
        }
 }
 
@@ -4554,9 +5048,8 @@ Editor::nudge_track (bool use_edit, bool forwards)
                return;
        }
 
-       begin_reversible_command (_("nudge track"));
-
        TrackViewList ts = selection->tracks.filter_to_unique_playlists ();
+       bool in_command = false;
 
        for (TrackViewList::iterator i = ts.begin(); i != ts.end(); ++i) {
 
@@ -4569,6 +5062,10 @@ Editor::nudge_track (bool use_edit, bool forwards)
 
                playlist->nudge_after (start, distance, forwards);
 
+               if (!in_command) {
+                       begin_reversible_command (_("nudge track"));
+                       in_command = true;
+               }
                vector<Command*> cmds;
 
                playlist->rdiff (cmds);
@@ -4577,7 +5074,9 @@ Editor::nudge_track (bool use_edit, bool forwards)
                _session->add_command (new StatefulDiffCommand (playlist));
        }
 
-       commit_reversible_command ();
+       if (in_command) {
+               commit_reversible_command ();
+       }
 }
 
 void
@@ -4592,12 +5091,12 @@ Editor::remove_last_capture ()
 
        if (Config->get_verify_remove_last_capture()) {
                prompt  = _("Do you really want to destroy the last capture?"
-                           "\n(This is destructive and cannot be undone)");
+                           "\n(This is destructive and cannot be undone)");
 
                choices.push_back (_("No, do nothing."));
                choices.push_back (_("Yes, destroy it."));
 
-               Gtkmm2ext::Choice prompter (_("Destroy last capture"), prompt, choices);
+               Choice prompter (_("Destroy last capture"), prompt, choices);
 
                if (prompter.run () == 1) {
                        _session->remove_last_capture ();
@@ -4625,11 +5124,11 @@ Editor::normalize_region ()
 
        NormalizeDialog dialog (rs.size() > 1);
 
-       if (dialog.run () == RESPONSE_CANCEL) {
+       if (dialog.run () != RESPONSE_ACCEPT) {
                return;
        }
 
-       set_canvas_cursor (_cursors->wait);
+       CursorContext::Handle cursor_ctx = CursorContext::create(*this, _cursors->wait);
        gdk_flush ();
 
        /* XXX: should really only count audio regions here */
@@ -4639,28 +5138,37 @@ Editor::normalize_region ()
           obtain the maximum amplitude of them all.
        */
        list<double> max_amps;
+       list<double> rms_vals;
        double max_amp = 0;
+       double max_rms = 0;
+       bool use_rms = dialog.constrain_rms ();
+
        for (RegionSelection::const_iterator i = rs.begin(); i != rs.end(); ++i) {
                AudioRegionView const * arv = dynamic_cast<AudioRegionView const *> (*i);
-               if (arv) {
-                       dialog.descend (1.0 / regions);
-                       double const a = arv->audio_region()->maximum_amplitude (&dialog);
-
-                       if (a == -1) {
-                               /* the user cancelled the operation */
-                               set_canvas_cursor (current_canvas_cursor);
-                               return;
-                       }
+               if (!arv) {
+                       continue;
+               }
+               dialog.descend (1.0 / regions);
+               double const a = arv->audio_region()->maximum_amplitude (&dialog);
+               if (use_rms) {
+                       double r = arv->audio_region()->rms (&dialog);
+                       max_rms = max (max_rms, r);
+                       rms_vals.push_back (r);
+               }
 
-                       max_amps.push_back (a);
-                       max_amp = max (max_amp, a);
-                       dialog.ascend ();
+               if (a == -1) {
+                       /* the user cancelled the operation */
+                       return;
                }
-       }
 
-       begin_reversible_command (_("normalize"));
+               max_amps.push_back (a);
+               max_amp = max (max_amp, a);
+               dialog.ascend ();
+       }
 
        list<double>::const_iterator a = max_amps.begin ();
+       list<double>::const_iterator l = rms_vals.begin ();
+       bool in_command = false;
 
        for (RegionSelection::iterator r = rs.begin(); r != rs.end(); ++r) {
                AudioRegionView* const arv = dynamic_cast<AudioRegionView*> (*r);
@@ -4670,16 +5178,35 @@ Editor::normalize_region ()
 
                arv->region()->clear_changes ();
 
-               double const amp = dialog.normalize_individually() ? *a : max_amp;
+               double amp = dialog.normalize_individually() ? *a : max_amp;
+               double target = dialog.target_peak (); // dB
+
+               if (use_rms) {
+                       double const amp_rms = dialog.normalize_individually() ? *l : max_rms;
+                       const double t_rms = dialog.target_rms ();
+                       const gain_t c_peak = dB_to_coefficient (target);
+                       const gain_t c_rms  = dB_to_coefficient (t_rms);
+                       if ((amp_rms / c_rms) > (amp / c_peak)) {
+                               amp = amp_rms;
+                               target = t_rms;
+                       }
+               }
+
+               arv->audio_region()->normalize (amp, target);
 
-               arv->audio_region()->normalize (amp, dialog.target ());
+               if (!in_command) {
+                       begin_reversible_command (_("normalize"));
+                       in_command = true;
+               }
                _session->add_command (new StatefulDiffCommand (arv->region()));
 
                ++a;
+               ++l;
        }
 
-       commit_reversible_command ();
-       set_canvas_cursor (current_canvas_cursor);
+       if (in_command) {
+               commit_reversible_command ();
+       }
 }
 
 
@@ -4696,7 +5223,7 @@ Editor::reset_region_scale_amplitude ()
                return;
        }
 
-       begin_reversible_command ("reset gain");
+       bool in_command = false;
 
        for (RegionSelection::iterator r = rs.begin(); r != rs.end(); ++r) {
                AudioRegionView* const arv = dynamic_cast<AudioRegionView*>(*r);
@@ -4704,10 +5231,17 @@ Editor::reset_region_scale_amplitude ()
                        continue;
                arv->region()->clear_changes ();
                arv->audio_region()->set_scale_amplitude (1.0f);
+
+               if(!in_command) {
+                               begin_reversible_command ("reset gain");
+                               in_command = true;
+               }
                _session->add_command (new StatefulDiffCommand (arv->region()));
        }
 
-       commit_reversible_command ();
+       if (in_command) {
+               commit_reversible_command ();
+       }
 }
 
 void
@@ -4719,7 +5253,7 @@ Editor::adjust_region_gain (bool up)
                return;
        }
 
-       begin_reversible_command ("adjust region gain");
+       bool in_command = false;
 
        for (RegionSelection::iterator r = rs.begin(); r != rs.end(); ++r) {
                AudioRegionView* const arv = dynamic_cast<AudioRegionView*>(*r);
@@ -4738,12 +5272,51 @@ Editor::adjust_region_gain (bool up)
                }
 
                arv->audio_region()->set_scale_amplitude (dB_to_coefficient (dB));
+
+               if (!in_command) {
+                               begin_reversible_command ("adjust region gain");
+                               in_command = true;
+               }
                _session->add_command (new StatefulDiffCommand (arv->region()));
        }
 
-       commit_reversible_command ();
+       if (in_command) {
+               commit_reversible_command ();
+       }
 }
 
+void
+Editor::reset_region_gain ()
+{
+       RegionSelection rs = get_regions_from_selection_and_entered ();
+
+       if (!_session || rs.empty()) {
+               return;
+       }
+
+       bool in_command = false;
+
+       for (RegionSelection::iterator r = rs.begin(); r != rs.end(); ++r) {
+               AudioRegionView* const arv = dynamic_cast<AudioRegionView*>(*r);
+               if (!arv) {
+                       continue;
+               }
+
+               arv->region()->clear_changes ();
+
+               arv->audio_region()->set_scale_amplitude (1.0f);
+
+               if (!in_command) {
+                               begin_reversible_command ("reset region gain");
+                               in_command = true;
+               }
+               _session->add_command (new StatefulDiffCommand (arv->region()));
+       }
+
+       if (in_command) {
+               commit_reversible_command ();
+       }
+}
 
 void
 Editor::reverse_region ()
@@ -4773,20 +5346,23 @@ Editor::strip_region_silence ()
 
        for (RegionSelection::iterator i = rs.begin(); i != rs.end(); ++i) {
                AudioRegionView* const arv = dynamic_cast<AudioRegionView*> (*i);
-               if (arv) {
+               if (arv) {
                        audio_only.push_back (arv);
                }
        }
 
+       assert (!audio_only.empty());
+
        StripSilenceDialog d (_session, audio_only);
        int const r = d.run ();
 
-        d.drop_rects ();
+       d.drop_rects ();
 
-        if (r == Gtk::RESPONSE_OK) {
-                ARDOUR::AudioIntervalMap silences;
-                d.silences (silences);
+       if (r == Gtk::RESPONSE_OK) {
+               ARDOUR::AudioIntervalMap silences;
+               d.silences (silences);
                StripSilence s (*_session, silences, d.fade_length());
+
                apply_filter (s, _("strip silence"), &d);
        }
 }
@@ -4794,40 +5370,39 @@ Editor::strip_region_silence ()
 Command*
 Editor::apply_midi_note_edit_op_to_region (MidiOperator& op, MidiRegionView& mrv)
 {
-       Evoral::Sequence<Evoral::MusicalTime>::Notes selected;
+       Evoral::Sequence<Evoral::Beats>::Notes selected;
        mrv.selection_as_notelist (selected, true);
 
-       vector<Evoral::Sequence<Evoral::MusicalTime>::Notes> v;
+       vector<Evoral::Sequence<Evoral::Beats>::Notes> v;
        v.push_back (selected);
 
-       framepos_t pos_frames = mrv.midi_region()->position() - mrv.midi_region()->start();
-       double     pos_beats  = _session->tempo_map().framewalk_to_beats(0, pos_frames);
+       Evoral::Beats pos_beats  = Evoral::Beats (mrv.midi_region()->beat()) - mrv.midi_region()->start_beats();
 
        return op (mrv.midi_region()->model(), pos_beats, v);
 }
 
 void
-Editor::apply_midi_note_edit_op (MidiOperator& op)
+Editor::apply_midi_note_edit_op (MidiOperator& op, const RegionSelection& rs)
 {
-       Command* cmd;
-
-       RegionSelection rs = get_regions_from_selection_and_entered ();
-
        if (rs.empty()) {
                return;
        }
 
-       begin_reversible_command (op.name ());
+       bool in_command = false;
 
-       for (RegionSelection::iterator r = rs.begin(); r != rs.end(); ) {
-               RegionSelection::iterator tmp = r;
+       for (RegionSelection::const_iterator r = rs.begin(); r != rs.end(); ) {
+               RegionSelection::const_iterator tmp = r;
                ++tmp;
 
                MidiRegionView* const mrv = dynamic_cast<MidiRegionView*> (*r);
 
                if (mrv) {
-                       cmd = apply_midi_note_edit_op_to_region (op, *mrv);
+                       Command* cmd = apply_midi_note_edit_op_to_region (op, *mrv);
                        if (cmd) {
+                               if (!in_command) {
+                                       begin_reversible_command (op.name ());
+                                       in_command = true;
+                               }
                                (*cmd)();
                                _session->add_command (cmd);
                        }
@@ -4836,7 +5411,9 @@ Editor::apply_midi_note_edit_op (MidiOperator& op)
                r = tmp;
        }
 
-       commit_reversible_command ();
+       if (in_command) {
+               commit_reversible_command ();
+       }
 }
 
 void
@@ -4848,9 +5425,9 @@ Editor::fork_region ()
                return;
        }
 
-       begin_reversible_command (_("Fork Region(s)"));
+       CursorContext::Handle cursor_ctx = CursorContext::create(*this, _cursors->wait);
+       bool in_command = false;
 
-       set_canvas_cursor (_cursors->wait);
        gdk_flush ();
 
        for (RegionSelection::iterator r = rs.begin(); r != rs.end(); ) {
@@ -4864,7 +5441,11 @@ Editor::fork_region ()
                                boost::shared_ptr<Playlist> playlist = mrv->region()->playlist();
                                boost::shared_ptr<MidiSource> new_source = _session->create_midi_source_by_stealing_name (mrv->midi_view()->track());
                                boost::shared_ptr<MidiRegion> newregion = mrv->midi_region()->clone (new_source);
-                               
+
+                               if (!in_command) {
+                                       begin_reversible_command (_("Fork Region(s)"));
+                                       in_command = true;
+                               }
                                playlist->clear_changes ();
                                playlist->replace_region (mrv->region(), newregion, mrv->region()->position());
                                _session->add_command(new StatefulDiffCommand (playlist));
@@ -4876,49 +5457,119 @@ Editor::fork_region ()
                r = tmp;
        }
 
-       commit_reversible_command ();
-
-       set_canvas_cursor (current_canvas_cursor);
+       if (in_command) {
+               commit_reversible_command ();
+       }
 }
 
 void
 Editor::quantize_region ()
 {
-       int selected_midi_region_cnt = 0;
+       if (_session) {
+               quantize_regions(get_regions_from_selection_and_entered ());
+       }
+}
 
-       if (!_session) {
+void
+Editor::quantize_regions (const RegionSelection& rs)
+{
+       if (rs.n_midi_regions() == 0) {
                return;
        }
 
-       RegionSelection rs = get_regions_from_selection_and_entered ();
+       if (!quantize_dialog) {
+               quantize_dialog = new QuantizeDialog (*this);
+       }
 
-       if (rs.empty()) {
+       if (quantize_dialog->is_mapped()) {
+               /* in progress already */
                return;
        }
 
-       for (RegionSelection::iterator r = rs.begin(); r != rs.end(); ++r) {
-               MidiRegionView* const mrv = dynamic_cast<MidiRegionView*> (*r);
-               if (mrv) {
-                       selected_midi_region_cnt++;
-               }
+       quantize_dialog->present ();
+       const int r = quantize_dialog->run ();
+       quantize_dialog->hide ();
+
+       if (r == Gtk::RESPONSE_OK) {
+               Quantize quant (quantize_dialog->snap_start(),
+                               quantize_dialog->snap_end(),
+                               quantize_dialog->start_grid_size(),
+                               quantize_dialog->end_grid_size(),
+                               quantize_dialog->strength(),
+                               quantize_dialog->swing(),
+                               quantize_dialog->threshold());
+
+               apply_midi_note_edit_op (quant, rs);
+       }
+}
+
+void
+Editor::legatize_region (bool shrink_only)
+{
+       if (_session) {
+               legatize_regions(get_regions_from_selection_and_entered (), shrink_only);
+       }
+}
+
+void
+Editor::legatize_regions (const RegionSelection& rs, bool shrink_only)
+{
+       if (rs.n_midi_regions() == 0) {
+               return;
+       }
+
+       Legatize legatize(shrink_only);
+       apply_midi_note_edit_op (legatize, rs);
+}
+
+void
+Editor::transform_region ()
+{
+       if (_session) {
+               transform_regions(get_regions_from_selection_and_entered ());
        }
+}
 
-       if (selected_midi_region_cnt == 0) {
+void
+Editor::transform_regions (const RegionSelection& rs)
+{
+       if (rs.n_midi_regions() == 0) {
                return;
        }
 
-       QuantizeDialog* qd = new QuantizeDialog (*this);
+       TransformDialog td;
 
-       qd->present ();
-       const int r = qd->run ();
-       qd->hide ();
+       td.present();
+       const int r = td.run();
+       td.hide();
 
        if (r == Gtk::RESPONSE_OK) {
-               Quantize quant (*_session, qd->snap_start(), qd->snap_end(),
-                               qd->start_grid_size(), qd->end_grid_size(),
-                               qd->strength(), qd->swing(), qd->threshold());
+               Transform transform(td.get());
+               apply_midi_note_edit_op(transform, rs);
+       }
+}
 
-               apply_midi_note_edit_op (quant);
+void
+Editor::transpose_region ()
+{
+       if (_session) {
+               transpose_regions(get_regions_from_selection_and_entered ());
+       }
+}
+
+void
+Editor::transpose_regions (const RegionSelection& rs)
+{
+       if (rs.n_midi_regions() == 0) {
+               return;
+       }
+
+       TransposeDialog d;
+       int const r = d.run ();
+
+       if (r == RESPONSE_ACCEPT) {
+               Transpose transpose(d.semitones ());
+               apply_midi_note_edit_op (transpose, rs);
        }
 }
 
@@ -4931,7 +5582,7 @@ Editor::insert_patch_change (bool from_context)
                return;
        }
 
-       const framepos_t p = get_preferred_edit_position (false, from_context);
+       const framepos_t p = get_preferred_edit_position (EDIT_IGNORE_NONE, from_context);
 
        /* XXX: bit of a hack; use the MIDNAM from the first selected region;
           there may be more than one, but the PatchChangeDialog can only offer
@@ -4939,8 +5590,8 @@ Editor::insert_patch_change (bool from_context)
        */
        MidiRegionView* first = dynamic_cast<MidiRegionView*> (rs.front ());
 
-       Evoral::PatchChange<Evoral::MusicalTime> empty (0, 0, 0, 0);
-        PatchChangeDialog d (0, _session, empty, first->instrument_info(), Gtk::Stock::ADD);
+       Evoral::PatchChange<Evoral::Beats> empty (Evoral::Beats(), 0, 0, 0);
+       PatchChangeDialog d (0, _session, empty, first->instrument_info(), Gtk::Stock::ADD);
 
        if (d.run() == RESPONSE_CANCEL) {
                return;
@@ -4965,9 +5616,9 @@ Editor::apply_filter (Filter& filter, string command, ProgressReporter* progress
                return;
        }
 
-       begin_reversible_command (command);
+       CursorContext::Handle cursor_ctx = CursorContext::create(*this, _cursors->wait);
+       bool in_command = false;
 
-       set_canvas_cursor (_cursors->wait);
        gdk_flush ();
 
        int n = 0;
@@ -4990,6 +5641,11 @@ Editor::apply_filter (Filter& filter, string command, ProgressReporter* progress
                                playlist->clear_changes ();
                                playlist->clear_owned_changes ();
 
+                               if (!in_command) {
+                                       begin_reversible_command (command);
+                                       in_command = true;
+                               }
+
                                if (filter.results.empty ()) {
 
                                        /* no regions returned; remove the old one */
@@ -5017,10 +5673,8 @@ Editor::apply_filter (Filter& filter, string command, ProgressReporter* progress
                                vector<Command*> cmds;
                                playlist->rdiff (cmds);
                                _session->add_commands (cmds);
-                               
+
                                _session->add_command(new StatefulDiffCommand (playlist));
-                       } else {
-                               goto out;
                        }
 
                        if (progress) {
@@ -5032,10 +5686,9 @@ Editor::apply_filter (Filter& filter, string command, ProgressReporter* progress
                ++n;
        }
 
-       commit_reversible_command ();
-
-  out:
-       set_canvas_cursor (current_canvas_cursor);
+       if (in_command) {
+               commit_reversible_command ();
+       }
 }
 
 void
@@ -5053,7 +5706,7 @@ Editor::reset_region_gain_envelopes ()
                return;
        }
 
-       _session->begin_reversible_command (_("reset region gain"));
+       bool in_command = false;
 
        for (RegionSelection::iterator i = rs.begin(); i != rs.end(); ++i) {
                AudioRegionView* const arv = dynamic_cast<AudioRegionView*>(*i);
@@ -5062,11 +5715,18 @@ Editor::reset_region_gain_envelopes ()
                        XMLNode& before (alist->get_state());
 
                        arv->audio_region()->set_default_envelope ();
+
+                       if (!in_command) {
+                               begin_reversible_command (_("reset region gain"));
+                               in_command = true;
+                       }
                        _session->add_command (new MementoCommand<AutomationList>(*arv->audio_region()->envelope().get(), &before, &alist->get_state()));
                }
        }
 
-       _session->commit_reversible_command ();
+       if (in_command) {
+               commit_reversible_command ();
+       }
 }
 
 void
@@ -5106,18 +5766,25 @@ Editor::toggle_gain_envelope_active ()
                return;
        }
 
-       _session->begin_reversible_command (_("region gain envelope active"));
+       bool in_command = false;
 
        for (RegionSelection::iterator i = rs.begin(); i != rs.end(); ++i) {
                AudioRegionView* const arv = dynamic_cast<AudioRegionView*>(*i);
                if (arv) {
                        arv->region()->clear_changes ();
                        arv->audio_region()->set_envelope_active (!arv->audio_region()->envelope_active());
+
+                       if (!in_command) {
+                               begin_reversible_command (_("region gain envelope active"));
+                               in_command = true;
+                       }
                        _session->add_command (new StatefulDiffCommand (arv->region()));
                }
        }
 
-       _session->commit_reversible_command ();
+       if (in_command) {
+               commit_reversible_command ();
+       }
 }
 
 void
@@ -5133,7 +5800,7 @@ Editor::toggle_region_lock ()
                return;
        }
 
-       _session->begin_reversible_command (_("toggle region lock"));
+       begin_reversible_command (_("toggle region lock"));
 
        for (RegionSelection::iterator i = rs.begin(); i != rs.end(); ++i) {
                (*i)->region()->clear_changes ();
@@ -5141,7 +5808,7 @@ Editor::toggle_region_lock ()
                _session->add_command (new StatefulDiffCommand ((*i)->region()));
        }
 
-       _session->commit_reversible_command ();
+       commit_reversible_command ();
 }
 
 void
@@ -5157,7 +5824,7 @@ Editor::toggle_region_video_lock ()
                return;
        }
 
-       _session->begin_reversible_command (_("Toggle Video Lock"));
+       begin_reversible_command (_("Toggle Video Lock"));
 
        for (RegionSelection::iterator i = rs.begin(); i != rs.end(); ++i) {
                (*i)->region()->clear_changes ();
@@ -5165,7 +5832,7 @@ Editor::toggle_region_video_lock ()
                _session->add_command (new StatefulDiffCommand ((*i)->region()));
        }
 
-       _session->commit_reversible_command ();
+       commit_reversible_command ();
 }
 
 void
@@ -5181,16 +5848,22 @@ Editor::toggle_region_lock_style ()
                return;
        }
 
-       _session->begin_reversible_command (_("region lock style"));
+       Glib::RefPtr<ToggleAction> a = Glib::RefPtr<ToggleAction>::cast_dynamic (_region_actions->get_action("toggle-region-lock-style"));
+       vector<Widget*> proxies = a->get_proxies();
+       Gtk::CheckMenuItem* cmi = dynamic_cast<Gtk::CheckMenuItem*> (proxies.front());
+
+       assert (cmi);
+
+       begin_reversible_command (_("toggle region lock style"));
 
        for (RegionSelection::iterator i = rs.begin(); i != rs.end(); ++i) {
                (*i)->region()->clear_changes ();
-               PositionLockStyle const ns = (*i)->region()->position_lock_style() == AudioTime ? MusicTime : AudioTime;
+               PositionLockStyle const ns = ((*i)->region()->position_lock_style() == AudioTime && !cmi->get_inconsistent()) ? MusicTime : AudioTime;
                (*i)->region()->set_position_lock_style (ns);
                _session->add_command (new StatefulDiffCommand ((*i)->region()));
        }
 
-       _session->commit_reversible_command ();
+       commit_reversible_command ();
 }
 
 void
@@ -5206,7 +5879,7 @@ Editor::toggle_opaque_region ()
                return;
        }
 
-       _session->begin_reversible_command (_("change region opacity"));
+       begin_reversible_command (_("change region opacity"));
 
        for (RegionSelection::iterator i = rs.begin(); i != rs.end(); ++i) {
                (*i)->region()->clear_changes ();
@@ -5214,7 +5887,7 @@ Editor::toggle_opaque_region ()
                _session->add_command (new StatefulDiffCommand ((*i)->region()));
        }
 
-       _session->commit_reversible_command ();
+       commit_reversible_command ();
 }
 
 void
@@ -5230,11 +5903,11 @@ Editor::toggle_record_enable ()
                        continue;
 
                if (first) {
-                       new_state = !rtav->track()->record_enabled();
+                       new_state = !rtav->track()->rec_enable_control()->get_value();
                        first = false;
                }
 
-               rtav->track()->set_record_enabled (new_state, this);
+               rtav->track()->rec_enable_control()->set_value (new_state, Controllable::UseGroup);
        }
 }
 
@@ -5243,7 +5916,7 @@ Editor::toggle_solo ()
 {
        bool new_state = false;
        bool first = true;
-       boost::shared_ptr<RouteList> rl (new RouteList);
+       boost::shared_ptr<ControlList> cl (new ControlList);
 
        for (TrackSelection::iterator i = selection->tracks.begin(); i != selection->tracks.end(); ++i) {
                RouteTimeAxisView *rtav = dynamic_cast<RouteTimeAxisView *>(*i);
@@ -5257,10 +5930,10 @@ Editor::toggle_solo ()
                        first = false;
                }
 
-               rl->push_back (rtav->route());
+               cl->push_back (rtav->route()->solo_control());
        }
 
-       _session->set_solo (rl, new_state, Session::rt_cleanup, true);
+       _session->set_controls (cl, new_state ? 1.0 : 0.0, Controllable::UseGroup);
 }
 
 void
@@ -5285,7 +5958,7 @@ Editor::toggle_mute ()
                rl->push_back (rtav->route());
        }
 
-       _session->set_mute (rl, new_state, Session::rt_cleanup, true);
+       _session->set_controls (route_list_to_control_list (rl, &Stripable::mute_control), new_state, Controllable::UseGroup);
 }
 
 void
@@ -5347,13 +6020,13 @@ Editor::set_fade_length (bool in)
                cmd = _("set fade out length");
        }
 
-       begin_reversible_command (cmd);
+       bool in_command = false;
 
        for (RegionSelection::iterator x = rs.begin(); x != rs.end(); ++x) {
                AudioRegionView* tmp = dynamic_cast<AudioRegionView*> (*x);
 
                if (!tmp) {
-                       return;
+                       continue;
                }
 
                boost::shared_ptr<AutomationList> alist;
@@ -5373,11 +6046,17 @@ Editor::set_fade_length (bool in)
                        tmp->audio_region()->set_fade_out_active (true);
                }
 
+               if (!in_command) {
+                       begin_reversible_command (cmd);
+                       in_command = true;
+               }
                XMLNode &after = alist->get_state();
                _session->add_command(new MementoCommand<AutomationList>(*alist, &before, &after));
        }
 
-       commit_reversible_command ();
+       if (in_command) {
+               commit_reversible_command ();
+       }
 }
 
 void
@@ -5388,14 +6067,13 @@ Editor::set_fade_in_shape (FadeShape shape)
        if (rs.empty()) {
                return;
        }
-
-       begin_reversible_command (_("set fade in shape"));
+       bool in_command = false;
 
        for (RegionSelection::iterator x = rs.begin(); x != rs.end(); ++x) {
                AudioRegionView* tmp = dynamic_cast<AudioRegionView*> (*x);
 
                if (!tmp) {
-                       return;
+                       continue;
                }
 
                boost::shared_ptr<AutomationList> alist = tmp->audio_region()->fade_in();
@@ -5403,12 +6081,17 @@ Editor::set_fade_in_shape (FadeShape shape)
 
                tmp->audio_region()->set_fade_in_shape (shape);
 
+               if (!in_command) {
+                       begin_reversible_command (_("set fade in shape"));
+                       in_command = true;
+               }
                XMLNode &after = alist->get_state();
                _session->add_command(new MementoCommand<AutomationList>(*alist.get(), &before, &after));
        }
 
-       commit_reversible_command ();
-
+       if (in_command) {
+               commit_reversible_command ();
+       }
 }
 
 void
@@ -5419,14 +6102,13 @@ Editor::set_fade_out_shape (FadeShape shape)
        if (rs.empty()) {
                return;
        }
-
-       begin_reversible_command (_("set fade out shape"));
+       bool in_command = false;
 
        for (RegionSelection::iterator x = rs.begin(); x != rs.end(); ++x) {
                AudioRegionView* tmp = dynamic_cast<AudioRegionView*> (*x);
 
                if (!tmp) {
-                       return;
+                       continue;
                }
 
                boost::shared_ptr<AutomationList> alist = tmp->audio_region()->fade_out();
@@ -5434,11 +6116,17 @@ Editor::set_fade_out_shape (FadeShape shape)
 
                tmp->audio_region()->set_fade_out_shape (shape);
 
+               if(!in_command) {
+                       begin_reversible_command (_("set fade out shape"));
+                       in_command = true;
+               }
                XMLNode &after = alist->get_state();
                _session->add_command(new MementoCommand<AutomationList>(*alist.get(), &before, &after));
        }
 
-       commit_reversible_command ();
+       if (in_command) {
+               commit_reversible_command ();
+       }
 }
 
 void
@@ -5449,14 +6137,13 @@ Editor::set_fade_in_active (bool yn)
        if (rs.empty()) {
                return;
        }
-
-       begin_reversible_command (_("set fade in active"));
+       bool in_command = false;
 
        for (RegionSelection::iterator x = rs.begin(); x != rs.end(); ++x) {
                AudioRegionView* tmp = dynamic_cast<AudioRegionView*> (*x);
 
                if (!tmp) {
-                       return;
+                       continue;
                }
 
 
@@ -5464,10 +6151,17 @@ Editor::set_fade_in_active (bool yn)
 
                ar->clear_changes ();
                ar->set_fade_in_active (yn);
+
+               if (!in_command) {
+                       begin_reversible_command (_("set fade in active"));
+                       in_command = true;
+               }
                _session->add_command (new StatefulDiffCommand (ar));
        }
 
-       commit_reversible_command ();
+       if (in_command) {
+               commit_reversible_command ();
+       }
 }
 
 void
@@ -5478,24 +6172,30 @@ Editor::set_fade_out_active (bool yn)
        if (rs.empty()) {
                return;
        }
-
-       begin_reversible_command (_("set fade out active"));
+       bool in_command = false;
 
        for (RegionSelection::iterator x = rs.begin(); x != rs.end(); ++x) {
                AudioRegionView* tmp = dynamic_cast<AudioRegionView*> (*x);
 
                if (!tmp) {
-                       return;
+                       continue;
                }
 
                boost::shared_ptr<AudioRegion> ar (tmp->audio_region());
 
                ar->clear_changes ();
                ar->set_fade_out_active (yn);
+
+               if (!in_command) {
+                       begin_reversible_command (_("set fade out active"));
+                       in_command = true;
+               }
                _session->add_command(new StatefulDiffCommand (ar));
        }
 
-       commit_reversible_command ();
+       if (in_command) {
+               commit_reversible_command ();
+       }
 }
 
 void
@@ -5504,7 +6204,7 @@ Editor::toggle_region_fades (int dir)
        if (_ignore_region_action) {
                return;
        }
-       
+
        boost::shared_ptr<AudioRegion> ar;
        bool yn = false;
 
@@ -5531,11 +6231,14 @@ Editor::toggle_region_fades (int dir)
        }
 
        /* XXX should this undo-able? */
+       bool in_command = false;
 
        for (RegionSelection::iterator i = rs.begin(); i != rs.end(); ++i) {
                if ((ar = boost::dynamic_pointer_cast<AudioRegion>((*i)->region())) == 0) {
                        continue;
                }
+               ar->clear_changes ();
+
                if (dir == 1 || dir == 0) {
                        ar->set_fade_in_active (!yn);
                }
@@ -5543,6 +6246,15 @@ Editor::toggle_region_fades (int dir)
                if (dir == -1 || dir == 0) {
                        ar->set_fade_out_active (!yn);
                }
+               if (!in_command) {
+                       begin_reversible_command (_("toggle fade active"));
+                       in_command = true;
+               }
+               _session->add_command(new StatefulDiffCommand (ar));
+       }
+
+       if (in_command) {
+               commit_reversible_command ();
        }
 }
 
@@ -5568,10 +6280,10 @@ Editor::update_region_fade_visibility ()
 void
 Editor::set_edit_point ()
 {
-       framepos_t where;
        bool ignored;
+       MusicFrame where (0, 0);
 
-       if (!mouse_frame (where, ignored)) {
+       if (!mouse_frame (where.frame, ignored)) {
                return;
        }
 
@@ -5579,7 +6291,7 @@ Editor::set_edit_point ()
 
        if (selection->markers.empty()) {
 
-               mouse_add_new_marker (where);
+               mouse_add_new_marker (where.frame);
 
        } else {
                bool ignored;
@@ -5587,7 +6299,7 @@ Editor::set_edit_point ()
                Location* loc = find_location_from_marker (selection->markers.front(), ignored);
 
                if (loc) {
-                       loc->move_to (where);
+                       loc->move_to (where.frame, where.division);
                }
        }
 }
@@ -5598,48 +6310,56 @@ Editor::set_playhead_cursor ()
        if (entered_marker) {
                _session->request_locate (entered_marker->position(), _session->transport_rolling());
        } else {
-               framepos_t where;
+               MusicFrame where (0, 0);
                bool ignored;
 
-               if (!mouse_frame (where, ignored)) {
+               if (!mouse_frame (where.frame, ignored)) {
                        return;
                }
 
                snap_to (where);
 
                if (_session) {
-                       _session->request_locate (where, _session->transport_rolling());
+                       _session->request_locate (where.frame, _session->transport_rolling());
                }
        }
 
-       if ( Config->get_follow_edits() )
-               cancel_time_selection();
+//not sure what this was for;  remove it for now.
+//     if (UIConfiguration::instance().get_follow_edits() && (!_session || !_session->config.get_external_sync())) {
+//             cancel_time_selection();
+//     }
+
 }
 
 void
 Editor::split_region ()
 {
+       if (_drags->active ()) {
+               return;
+       }
+
+       //if a range is selected, separate it
        if ( !selection->time.empty()) {
                separate_regions_between (selection->time);
                return;
        }
 
-       RegionSelection rs = get_regions_from_selection_and_edit_point ();
+       //if no range was selected, try to find some regions to split
+       if (current_mouse_mode() == MouseObject) {  //don't try this for Internal Edit, Stretch, Draw, etc.
 
-       framepos_t where = get_preferred_edit_position ();
+               RegionSelection rs = get_regions_from_selection_and_edit_point ();
+               const framepos_t pos = get_preferred_edit_position();
+               const int32_t division = get_grid_music_divisions (0);
+               MusicFrame where (pos, division);
 
-       if (rs.empty()) {
-               return;
-       }
+               if (rs.empty()) {
+                       return;
+               }
 
-       split_regions_at (where, rs);
-}
+               split_regions_at (where, rs);
 
-struct EditorOrderRouteSorter {
-    bool operator() (boost::shared_ptr<Route> a, boost::shared_ptr<Route> b) {
-           return a->order_key () < b->order_key ();
-    }
-};
+       }
+}
 
 void
 Editor::select_next_route()
@@ -5654,6 +6374,7 @@ Editor::select_next_route()
        RouteUI *rui;
        do {
                for (TrackViewList::iterator i = track_views.begin(); i != track_views.end(); ++i) {
+
                        if (*i == current) {
                                ++i;
                                if (i != track_views.end()) {
@@ -5665,10 +6386,12 @@ Editor::select_next_route()
                                break;
                        }
                }
+
                rui = dynamic_cast<RouteUI *>(current);
-       } while ( current->hidden() || (rui != NULL && !rui->route()->active()));
 
-       selection->set(current);
+       } while (current->hidden() || (rui == NULL) || !rui->route()->active());
+
+       selection->set (current);
 
        ensure_time_axis_view_is_visible (*current, false);
 }
@@ -5686,6 +6409,7 @@ Editor::select_prev_route()
        RouteUI *rui;
        do {
                for (TrackViewList::reverse_iterator i = track_views.rbegin(); i != track_views.rend(); ++i) {
+
                        if (*i == current) {
                                ++i;
                                if (i != track_views.rend()) {
@@ -5697,7 +6421,8 @@ Editor::select_prev_route()
                        }
                }
                rui = dynamic_cast<RouteUI *>(current);
-       } while ( current->hidden() || (rui != NULL && !rui->route()->active()));
+
+       } while (current->hidden() || (rui == NULL) || !rui->route()->active());
 
        selection->set (current);
 
@@ -5707,15 +6432,30 @@ Editor::select_prev_route()
 void
 Editor::set_loop_from_selection (bool play)
 {
-       if (_session == 0 || selection->time.empty()) {
+       if (_session == 0) {
                return;
        }
 
-       framepos_t start = selection->time[clicked_selection].start;
-       framepos_t end = selection->time[clicked_selection].end;
+       framepos_t start, end;
+       if (!get_selection_extents ( start, end))
+               return;
 
        set_loop_range (start, end,  _("set loop range from selection"));
 
+       if (play) {
+               _session->request_play_loop (true, true);
+       }
+}
+
+void
+Editor::set_loop_from_region (bool play)
+{
+       framepos_t start, end;
+       if (!get_selection_extents ( start, end))
+               return;
+
+       set_loop_range (start, end, _("set loop range from region"));
+
        if (play) {
                _session->request_locate (start, true);
                _session->request_play_loop (true);
@@ -5723,106 +6463,230 @@ Editor::set_loop_from_selection (bool play)
 }
 
 void
-Editor::set_loop_from_edit_range (bool play)
+Editor::set_punch_from_selection ()
 {
        if (_session == 0) {
                return;
        }
 
-       framepos_t start;
-       framepos_t end;
+       framepos_t start, end;
+       if (!get_selection_extents ( start, end))
+               return;
 
-       if (!get_edit_op_range (start, end)) {
+       set_punch_range (start, end,  _("set punch range from selection"));
+}
+
+void
+Editor::set_auto_punch_range ()
+{
+       // auto punch in/out button from a single button
+       // If Punch In is unset, set punch range from playhead to end, enable punch in
+       // If Punch In is set, the next punch sets Punch Out, unless the playhead has been
+       //   rewound beyond the Punch In marker, in which case that marker will be moved back
+       //   to the current playhead position.
+       // If punch out is set, it clears the punch range and Punch In/Out buttons
+
+       if (_session == 0) {
                return;
        }
 
-       set_loop_range (start, end,  _("set loop range from edit range"));
+       Location* tpl = transport_punch_location();
+       framepos_t now = playhead_cursor->current_frame();
+       framepos_t begin = now;
+       framepos_t end = _session->current_end_frame();
 
-       if (play) {
-               _session->request_locate (start, true);
-               _session->request_play_loop (true);
+       if (!_session->config.get_punch_in()) {
+               // First Press - set punch in and create range from here to eternity
+               set_punch_range (begin, end, _("Auto Punch In"));
+               _session->config.set_punch_in(true);
+       } else if (tpl && !_session->config.get_punch_out()) {
+               // Second press - update end range marker and set punch_out
+               if (now < tpl->start()) {
+                       // playhead has been rewound - move start back  and pretend nothing happened
+                       begin = now;
+                       set_punch_range (begin, end, _("Auto Punch In/Out"));
+               } else {
+                       // normal case for 2nd press - set the punch out
+                       end = playhead_cursor->current_frame ();
+                       set_punch_range (tpl->start(), now, _("Auto Punch In/Out"));
+                       _session->config.set_punch_out(true);
+               }
+       } else  {
+               if (_session->config.get_punch_out()) {
+                       _session->config.set_punch_out(false);
+               }
+
+               if (_session->config.get_punch_in()) {
+                       _session->config.set_punch_in(false);
+               }
+
+               if (tpl)
+               {
+                       // third press - unset punch in/out and remove range
+                       _session->locations()->remove(tpl);
+               }
        }
+
 }
 
 void
-Editor::set_loop_from_region (bool play)
+Editor::set_session_extents_from_selection ()
 {
-       framepos_t start = max_framepos;
-       framepos_t end = 0;
-
-       RegionSelection rs = get_regions_from_selection_and_entered ();
+       if (_session == 0) {
+               return;
+       }
 
-       if (rs.empty()) {
+       framepos_t start, end;
+       if (!get_selection_extents ( start, end))
                return;
+
+       Location* loc;
+       if ((loc = _session->locations()->session_range_location()) == 0) {
+               _session->set_session_extents (start, end);  // this will create a new session range;  no need for UNDO
+       } else {
+               XMLNode &before = loc->get_state();
+
+               _session->set_session_extents (start, end);
+
+               XMLNode &after = loc->get_state();
+
+               begin_reversible_command (_("set session start/end from selection"));
+
+               _session->add_command (new MementoCommand<Location>(*loc, &before, &after));
+
+               commit_reversible_command ();
        }
 
-       for (RegionSelection::iterator i = rs.begin(); i != rs.end(); ++i) {
-               if ((*i)->region()->position() < start) {
-                       start = (*i)->region()->position();
+       _session->set_end_is_free (false);
+}
+
+void
+Editor::set_punch_start_from_edit_point ()
+{
+       if (_session) {
+
+               MusicFrame start (0, 0);
+               framepos_t end = max_framepos;
+
+               //use the existing punch end, if any
+               Location* tpl = transport_punch_location();
+               if (tpl) {
+                       end = tpl->end();
                }
-               if ((*i)->region()->last_frame() + 1 > end) {
-                       end = (*i)->region()->last_frame() + 1;
+
+               if ((_edit_point == EditAtPlayhead) && _session->transport_rolling()) {
+                       start.frame = _session->audible_frame();
+               } else {
+                       start.frame = get_preferred_edit_position();
                }
-       }
 
-       set_loop_range (start, end, _("set loop range from region"));
+               //snap the selection start/end
+               snap_to(start);
 
-       if (play) {
-               _session->request_locate (start, true);
-               _session->request_play_loop (true);
+               //if there's not already a sensible selection endpoint, go "forever"
+               if (start.frame > end ) {
+                       end = max_framepos;
+               }
+
+               set_punch_range (start.frame, end, _("set punch start from EP"));
        }
+
 }
 
 void
-Editor::set_punch_from_selection ()
+Editor::set_punch_end_from_edit_point ()
 {
-       if (_session == 0 || selection->time.empty()) {
-               return;
+       if (_session) {
+
+               framepos_t start = 0;
+               MusicFrame end (max_framepos, 0);
+
+               //use the existing punch start, if any
+               Location* tpl = transport_punch_location();
+               if (tpl) {
+                       start = tpl->start();
+               }
+
+               if ((_edit_point == EditAtPlayhead) && _session->transport_rolling()) {
+                       end.frame = _session->audible_frame();
+               } else {
+                       end.frame = get_preferred_edit_position();
+               }
+
+               //snap the selection start/end
+               snap_to (end);
+
+               set_punch_range (start, end.frame, _("set punch end from EP"));
+
        }
+}
 
-       framepos_t start = selection->time[clicked_selection].start;
-       framepos_t end = selection->time[clicked_selection].end;
+void
+Editor::set_loop_start_from_edit_point ()
+{
+       if (_session) {
+
+               MusicFrame start (0, 0);
+               framepos_t end = max_framepos;
+
+               //use the existing loop end, if any
+               Location* tpl = transport_loop_location();
+               if (tpl) {
+                       end = tpl->end();
+               }
+
+               if ((_edit_point == EditAtPlayhead) && _session->transport_rolling()) {
+                       start.frame = _session->audible_frame();
+               } else {
+                       start.frame = get_preferred_edit_position();
+               }
+
+               //snap the selection start/end
+               snap_to (start);
+
+               //if there's not already a sensible selection endpoint, go "forever"
+               if (start.frame > end ) {
+                       end = max_framepos;
+               }
+
+               set_loop_range (start.frame, end, _("set loop start from EP"));
+       }
 
-       set_punch_range (start, end,  _("set punch range from selection"));
 }
 
 void
-Editor::set_punch_from_edit_range ()
+Editor::set_loop_end_from_edit_point ()
 {
-       if (_session == 0) {
-               return;
-       }
+       if (_session) {
 
-       framepos_t start;
-       framepos_t end;
+               framepos_t start = 0;
+               MusicFrame end (max_framepos, 0);
 
-       if (!get_edit_op_range (start, end)) {
-               return;
-       }
+               //use the existing loop start, if any
+               Location* tpl = transport_loop_location();
+               if (tpl) {
+                       start = tpl->start();
+               }
+
+               if ((_edit_point == EditAtPlayhead) && _session->transport_rolling()) {
+                       end.frame = _session->audible_frame();
+               } else {
+                       end.frame = get_preferred_edit_position();
+               }
 
-       set_punch_range (start, end,  _("set punch range from edit range"));
+               //snap the selection start/end
+               snap_to(end);
+
+               set_loop_range (start, end.frame, _("set loop end from EP"));
+       }
 }
 
 void
 Editor::set_punch_from_region ()
 {
-       framepos_t start = max_framepos;
-       framepos_t end = 0;
-
-       RegionSelection rs = get_regions_from_selection_and_entered ();
-
-       if (rs.empty()) {
+       framepos_t start, end;
+       if (!get_selection_extents ( start, end))
                return;
-       }
-
-       for (RegionSelection::iterator i = rs.begin(); i != rs.end(); ++i) {
-               if ((*i)->region()->position() < start) {
-                       start = (*i)->region()->position();
-               }
-               if ((*i)->region()->last_frame() + 1 > end) {
-                       end = (*i)->region()->last_frame() + 1;
-               }
-       }
 
        set_punch_range (start, end, _("set punch range from region"));
 }
@@ -5846,30 +6710,6 @@ Editor::pitch_shift_region ()
        pitch_shift (audio_rs, 1.2);
 }
 
-void
-Editor::transpose_region ()
-{
-       RegionSelection rs = get_regions_from_selection_and_entered ();
-
-       list<MidiRegionView*> midi_region_views;
-       for (RegionSelection::iterator i = rs.begin(); i != rs.end(); ++i) {
-               MidiRegionView* mrv = dynamic_cast<MidiRegionView*> (*i);
-               if (mrv) {
-                       midi_region_views.push_back (mrv);
-               }
-       }
-
-       TransposeDialog d;
-       int const r = d.run ();
-       if (r != RESPONSE_ACCEPT) {
-               return;
-       }
-
-       for (list<MidiRegionView*>::iterator i = midi_region_views.begin(); i != midi_region_views.end(); ++i) {
-               (*i)->midi_region()->transpose (d.semitones ());
-       }
-}
-
 void
 Editor::set_tempo_from_region ()
 {
@@ -5898,11 +6738,13 @@ Editor::define_one_bar (framepos_t start, framepos_t end)
 {
        framepos_t length = end - start;
 
-       const Meter& m (_session->tempo_map().meter_at (start));
+       const Meter& m (_session->tempo_map().meter_at_frame (start));
 
        /* length = 1 bar */
 
-       /* now we want frames per beat.
+       /* We're going to deliver a constant tempo here,
+          so we can use frames per beat to determine length.
+          now we want frames per beat.
           we have frames per bar, and beats per bar, so ...
        */
 
@@ -5921,7 +6763,7 @@ Editor::define_one_bar (framepos_t start, framepos_t end)
 
        */
 
-       const TempoSection& t (_session->tempo_map().tempo_section_at (start));
+       const TempoSection& t (_session->tempo_map().tempo_section_at_frame (start));
 
        bool do_global = false;
 
@@ -5968,13 +6810,13 @@ Editor::define_one_bar (framepos_t start, framepos_t end)
        XMLNode& before (_session->tempo_map().get_state());
 
        if (do_global) {
-               _session->tempo_map().change_initial_tempo (beats_per_minute, t.note_type());
+               _session->tempo_map().change_initial_tempo (beats_per_minute, t.note_type(), t.end_note_types_per_minute());
        } else if (t.frame() == start) {
-               _session->tempo_map().change_existing_tempo_at (start, beats_per_minute, t.note_type());
+               _session->tempo_map().change_existing_tempo_at (start, beats_per_minute, t.note_type(), t.end_note_types_per_minute());
        } else {
-               Timecode::BBT_Time bbt;
-               _session->tempo_map().bbt_time (start, bbt);
-               _session->tempo_map().add_tempo (Tempo (beats_per_minute, t.note_type()), bbt);
+               /* constant tempo */
+               const Tempo tempo (beats_per_minute, t.note_type());
+               _session->tempo_map().add_tempo (tempo, 0.0, start, AudioTime);
        }
 
        XMLNode& after (_session->tempo_map().get_state());
@@ -5994,7 +6836,7 @@ Editor::split_region_at_transients ()
                return;
        }
 
-       _session->begin_reversible_command (_("split regions"));
+       begin_reversible_command (_("split regions"));
 
        for (RegionSelection::iterator i = rs.begin(); i != rs.end(); ) {
 
@@ -6005,7 +6847,8 @@ Editor::split_region_at_transients ()
 
                boost::shared_ptr<AudioRegion> ar = boost::dynamic_pointer_cast<AudioRegion> ((*i)->region());
 
-               if (ar && (ar->get_transients (positions) == 0)) {
+               if (ar) {
+                       ar->transients (positions);
                        split_region_at_points ((*i)->region(), positions, true);
                        positions.clear ();
                }
@@ -6013,7 +6856,7 @@ Editor::split_region_at_transients ()
                i = tmp;
        }
 
-       _session->commit_reversible_command ();
+       commit_reversible_command ();
 
 }
 
@@ -6034,7 +6877,6 @@ Editor::split_region_at_points (boost::shared_ptr<Region> r, AnalysisFeatureList
                return;
        }
 
-
        if (positions.size() > 20 && can_ferret) {
                std::string msgstr = string_compose (_("You are about to split\n%1\ninto %2 pieces.\nThis could take a long time."), r->name(), positions.size() + 1);
                MessageDialog msg (msgstr,
@@ -6087,27 +6929,28 @@ Editor::split_region_at_points (boost::shared_ptr<Region> r, AnalysisFeatureList
 
        framepos_t pos = 0;
 
+       framepos_t rstart = r->first_frame ();
+       framepos_t rend = r->last_frame ();
+
        while (x != positions.end()) {
 
                /* deal with positons that are out of scope of present region bounds */
-               if (*x <= 0 || *x > r->length()) {
+               if (*x <= rstart || *x > rend) {
                        ++x;
                        continue;
                }
 
-               /* file start = original start + how far we from the initial position ?
-                */
+               /* file start = original start + how far we from the initial position ?  */
 
                framepos_t file_start = r->start() + pos;
 
-               /* length = next position - current position
-                */
+               /* length = next position - current position */
 
-               framepos_t len = (*x) - pos;
+               framepos_t len = (*x) - pos - rstart;
 
                /* XXX we do we really want to allow even single-sample regions?
-                  shouldn't we have some kind of lower limit on region size?
-               */
+                * shouldn't we have some kind of lower limit on region size?
+                */
 
                if (len <= 0) {
                        break;
@@ -6127,14 +6970,15 @@ Editor::split_region_at_points (boost::shared_ptr<Region> r, AnalysisFeatureList
                plist.add (ARDOUR::Properties::length, len);
                plist.add (ARDOUR::Properties::name, new_name);
                plist.add (ARDOUR::Properties::layer, 0);
+               // TODO set transients_offset
 
                boost::shared_ptr<Region> nr = RegionFactory::create (r->sources(), plist, false);
                /* because we set annouce to false, manually add the new region to the
-                  RegionFactory map
-               */
+                * RegionFactory map
+                */
                RegionFactory::map_add (nr);
 
-               pl->add_region (nr, r->position() + pos);
+               pl->add_region (nr, rstart + pos);
 
                if (select_new) {
                        new_regions.push_front(nr);
@@ -6175,7 +7019,7 @@ Editor::split_region_at_points (boost::shared_ptr<Region> r, AnalysisFeatureList
        vector<Command*> cmds;
        pl->rdiff (cmds);
        _session->add_commands (cmds);
-       
+
        _session->add_command (new StatefulDiffCommand (pl));
 
        if (select_new) {
@@ -6201,14 +7045,13 @@ Editor::place_transient()
 
        framepos_t where = get_preferred_edit_position();
 
-       _session->begin_reversible_command (_("place transient"));
+       begin_reversible_command (_("place transient"));
 
        for (RegionSelection::iterator r = rs.begin(); r != rs.end(); ++r) {
-               framepos_t position = (*r)->region()->position();
-               (*r)->region()->add_transient(where - position);
+               (*r)->region()->add_transient(where);
        }
 
-       _session->commit_reversible_command ();
+       commit_reversible_command ();
 }
 
 void
@@ -6236,7 +7079,7 @@ Editor::snap_regions_to_grid ()
                return;
        }
 
-       _session->begin_reversible_command (_("snap regions to grid"));
+       begin_reversible_command (_("snap regions to grid"));
 
        for (RegionSelection::iterator r = rs.begin(); r != rs.end(); ++r) {
 
@@ -6249,10 +7092,12 @@ Editor::snap_regions_to_grid ()
                        used_playlists.push_back(pl);
                        pl->freeze();
                }
+               (*r)->region()->clear_changes ();
 
-               framepos_t start_frame = (*r)->region()->first_frame ();
-               snap_to (start_frame);
-               (*r)->region()->set_position (start_frame);
+               MusicFrame start ((*r)->region()->first_frame (), 0);
+               snap_to (start);
+               (*r)->region()->set_position (start.frame, start.division);
+               _session->add_command(new StatefulDiffCommand ((*r)->region()));
        }
 
        while (used_playlists.size() > 0) {
@@ -6261,7 +7106,7 @@ Editor::snap_regions_to_grid ()
                used_playlists.pop_front();
        }
 
-       _session->commit_reversible_command ();
+       commit_reversible_command ();
 }
 
 void
@@ -6319,7 +7164,7 @@ Editor::close_region_gaps ()
 
        /* Iterate over the region list and make adjacent regions overlap by crossfade_len_ms */
 
-       _session->begin_reversible_command (_("close region gaps"));
+       begin_reversible_command (_("close region gaps"));
 
        int idx = 0;
        boost::shared_ptr<Region> last_region;
@@ -6346,11 +7191,16 @@ Editor::close_region_gaps ()
                        continue;
                }
 
+               (*r)->region()->clear_changes ();
                (*r)->region()->trim_front( (position - pull_back_frames));
+
+               last_region->clear_changes ();
                last_region->trim_end( (position - pull_back_frames + crossfade_len));
 
-               last_region = (*r)->region();
+               _session->add_command (new StatefulDiffCommand ((*r)->region()));
+               _session->add_command (new StatefulDiffCommand (last_region));
 
+               last_region = (*r)->region();
                idx++;
        }
 
@@ -6360,7 +7210,7 @@ Editor::close_region_gaps ()
                used_playlists.pop_front();
        }
 
-       _session->commit_reversible_command ();
+       commit_reversible_command ();
 }
 
 void
@@ -6449,12 +7299,13 @@ Editor::playhead_forward_to_grid ()
        if (!_session) {
                return;
        }
-       
-       framepos_t pos = playhead_cursor->current_frame ();
-       if (pos < max_framepos - 1) {
-               pos += 2;
-               snap_to_internal (pos, 1, false);
-               _session->request_locate (pos);
+
+       MusicFrame pos (playhead_cursor->current_frame (), 0);
+
+       if (pos.frame < max_framepos - 1) {
+               pos.frame += 2;
+               snap_to_internal (pos, RoundUpAlways, false, true);
+               _session->request_locate (pos.frame);
        }
 }
 
@@ -6465,12 +7316,13 @@ Editor::playhead_backward_to_grid ()
        if (!_session) {
                return;
        }
-       
-       framepos_t pos = playhead_cursor->current_frame ();
-       if (pos > 2) {
-               pos -= 2;
-               snap_to_internal (pos, -1, false);
-               _session->request_locate (pos);
+
+       MusicFrame pos  (playhead_cursor->current_frame (), 0);
+
+       if (pos.frame > 2) {
+               pos.frame -= 2;
+               snap_to_internal (pos, RoundDownAlways, false, true);
+               _session->request_locate (pos.frame);
        }
 }
 
@@ -6510,6 +7362,24 @@ Editor::toggle_tracks_active ()
 
 void
 Editor::remove_tracks ()
+{
+       /* this will delete GUI objects that may be the subject of an event
+          handler in which this method is called. Defer actual deletion to the
+          next idle callback, when all event handling is finished.
+       */
+       Glib::signal_idle().connect (sigc::mem_fun (*this, &Editor::idle_remove_tracks));
+}
+
+bool
+Editor::idle_remove_tracks ()
+{
+       Session::StateProtector sp (_session);
+       _remove_tracks ();
+       return false; /* do not call again */
+}
+
+void
+Editor::_remove_tracks ()
 {
        TrackSelection& ts (selection->tracks);
 
@@ -6565,17 +7435,8 @@ edit your ardour.rc file to set the\n\
                return;
        }
 
-       if (ntracks > 1) {
-               trackstr = _("tracks");
-       } else {
-               trackstr = _("track");
-       }
-
-       if (nbusses > 1) {
-               busstr = _("busses");
-       } else {
-               busstr = _("bus");
-       }
+       trackstr = P_("track", "tracks", ntracks);
+       busstr = P_("bus", "busses", nbusses);
 
        if (ntracks) {
                if (nbusses) {
@@ -6591,7 +7452,7 @@ edit your ardour.rc file to set the\n\
                }
        } else if (nbusses) {
                prompt  = string_compose (_("Do you really want to remove %1 %2?\n\n"
-                                           "This action cannot be undon, and the session file will be overwritten"),
+                                           "This action cannot be undone, and the session file will be overwritten"),
                                          nbusses, busstr);
        }
 
@@ -6615,13 +7476,38 @@ edit your ardour.rc file to set the\n\
                return;
        }
 
+       if (current_mixer_strip && routes.size () > 1 && std::find (routes.begin(), routes.end(), current_mixer_strip->route()) != routes.end ()) {
+               /* Route deletion calls Editor::timeaxisview_deleted() iteratively (for each deleted
+                * route). If the deleted route is currently displayed in the Editor-Mixer (highly
+                * likely because deletion requires selection) this will call
+                * Editor::set_selected_mixer_strip () which is expensive ( MixerStrip::set_route() ).
+                * It's likewise likely that the route that has just been displayed in the
+                * Editor-Mixer will be next in line for deletion.
+                *
+                * So simply switch to the master-bus (if present)
+                */
+               for (TrackViewList::iterator i = track_views.begin(); i != track_views.end(); ++i) {
+                       if ((*i)->stripable ()->is_master ()) {
+                               set_selected_mixer_strip (*(*i));
+                               break;
+                       }
+               }
+       }
+
        {
-               Session::StateProtector sp (_session);
+               PresentationInfo::ChangeSuspender cs;
                DisplaySuspender ds;
+
+               boost::shared_ptr<RouteList> rl (new RouteList);
                for (vector<boost::shared_ptr<Route> >::iterator x = routes.begin(); x != routes.end(); ++x) {
-                       _session->remove_route (*x);
+                       rl->push_back (*x);
                }
+               _session->remove_routes (rl);
        }
+       /* TrackSelection and RouteList leave scope,
+        * destructors are called,
+        * diskstream drops references, save_state is called (again for every track)
+        */
 }
 
 void
@@ -6631,7 +7517,7 @@ Editor::do_insert_time ()
                return;
        }
 
-       InsertTimeDialog d (*this);
+       InsertRemoveTimeDialog d (*this);
        int response = d.run ();
 
        if (response != RESPONSE_OK) {
@@ -6642,12 +7528,10 @@ Editor::do_insert_time ()
                return;
        }
 
-       InsertTimeOption opt = d.intersected_region_action ();
-
        insert_time (
-               get_preferred_edit_position(),
+               d.position(),
                d.distance(),
-               opt,
+               d.intersected_region_action (),
                d.all_playlists(),
                d.move_glued(),
                d.move_markers(),
@@ -6663,13 +7547,11 @@ Editor::insert_time (
        bool all_playlists, bool ignore_music_glue, bool markers_too, bool glued_markers_too, bool locked_markers_too, bool tempo_too
        )
 {
-       bool commit = false;
 
        if (Config->get_edit_mode() == Lock) {
                return;
        }
-
-       begin_reversible_command (_("insert time"));
+       bool in_command = false;
 
        TrackViewList ts = selection->tracks.filter_to_unique_playlists ();
 
@@ -6686,7 +7568,7 @@ Editor::insert_time (
 
                if (all_playlists) {
                        RouteTimeAxisView* rtav = dynamic_cast<RouteTimeAxisView*> (*x);
-                       if (rtav) {
+                       if (rtav && rtav->track ()) {
                                vector<boost::shared_ptr<Playlist> > all = _session->playlists->playlists_for_track (rtav->track ());
                                for (vector<boost::shared_ptr<Playlist> >::iterator p = all.begin(); p != all.end(); ++p) {
                                        pl.insert (*p);
@@ -6697,14 +7579,20 @@ Editor::insert_time (
                                pl.insert ((*x)->playlist ());
                        }
                }
-               
+
                for (set<boost::shared_ptr<Playlist> >::iterator i = pl.begin(); i != pl.end(); ++i) {
 
                        (*i)->clear_changes ();
                        (*i)->clear_owned_changes ();
 
+                       if (!in_command) {
+                               begin_reversible_command (_("insert time"));
+                               in_command = true;
+                       }
+
                        if (opt == SplitIntersected) {
-                               (*i)->split (pos);
+                               /* non musical split */
+                               (*i)->split (MusicFrame (pos, 0));
                        }
 
                        (*i)->shift (pos, frames, (opt == MoveIntersected), ignore_music_glue);
@@ -6714,20 +7602,23 @@ Editor::insert_time (
                        _session->add_commands (cmds);
 
                        _session->add_command (new StatefulDiffCommand (*i));
-                       commit = true;
                }
 
                /* automation */
                RouteTimeAxisView* rtav = dynamic_cast<RouteTimeAxisView*> (*x);
                if (rtav) {
+                       if (!in_command) {
+                               begin_reversible_command (_("insert time"));
+                               in_command = true;
+                       }
                        rtav->route ()->shift (pos, frames);
-                       commit = true;
                }
        }
 
        /* markers */
        if (markers_too) {
                bool moved = false;
+               const int32_t divisions = get_grid_music_divisions (0);
                XMLNode& before (_session->locations()->get_state());
                Locations::LocationList copy (_session->locations()->list());
 
@@ -6735,72 +7626,252 @@ Editor::insert_time (
 
                        Locations::LocationList::const_iterator tmp;
 
-                       bool const was_locked = (*i)->locked ();
-                       if (locked_markers_too) {
-                               (*i)->unlock ();
-                       }
-
                        if ((*i)->position_lock_style() == AudioTime || glued_markers_too) {
+                               bool const was_locked = (*i)->locked ();
+                               if (locked_markers_too) {
+                                       (*i)->unlock ();
+                               }
 
                                if ((*i)->start() >= pos) {
-                                       (*i)->set_start ((*i)->start() + frames);
+                                       // move end first, in case we're moving by more than the length of the range
                                        if (!(*i)->is_mark()) {
-                                               (*i)->set_end ((*i)->end() + frames);
+                                               (*i)->set_end ((*i)->end() + frames, false, true, divisions);
                                        }
+                                       (*i)->set_start ((*i)->start() + frames, false, true, divisions);
                                        moved = true;
                                }
 
-                       }
-
-                       if (was_locked) {
-                               (*i)->lock ();
+                               if (was_locked) {
+                                       (*i)->lock ();
+                               }
                        }
                }
 
                if (moved) {
+                       if (!in_command) {
+                               begin_reversible_command (_("insert time"));
+                               in_command = true;
+                       }
                        XMLNode& after (_session->locations()->get_state());
                        _session->add_command (new MementoCommand<Locations>(*_session->locations(), &before, &after));
                }
        }
 
        if (tempo_too) {
+               if (!in_command) {
+                       begin_reversible_command (_("insert time"));
+                       in_command = true;
+               }
+               XMLNode& before (_session->tempo_map().get_state());
                _session->tempo_map().insert_time (pos, frames);
+               XMLNode& after (_session->tempo_map().get_state());
+               _session->add_command (new MementoCommand<TempoMap>(_session->tempo_map(), &before, &after));
        }
 
-       if (commit) {
+       if (in_command) {
                commit_reversible_command ();
        }
 }
 
 void
-Editor::fit_selected_tracks ()
+Editor::do_remove_time ()
+{
+       if (selection->tracks.empty()) {
+               return;
+       }
+
+       InsertRemoveTimeDialog d (*this, true);
+
+       int response = d.run ();
+
+       if (response != RESPONSE_OK) {
+               return;
+       }
+
+       framecnt_t distance = d.distance();
+
+       if (distance == 0) {
+               return;
+       }
+
+       remove_time (
+               d.position(),
+               distance,
+               SplitIntersected,
+               d.move_glued(),
+               d.move_markers(),
+               d.move_glued_markers(),
+               d.move_locked_markers(),
+               d.move_tempos()
+       );
+}
+
+void
+Editor::remove_time (framepos_t pos, framecnt_t frames, InsertTimeOption opt,
+                     bool ignore_music_glue, bool markers_too, bool glued_markers_too, bool locked_markers_too, bool tempo_too)
 {
-        if (!selection->tracks.empty()) {
-                fit_tracks (selection->tracks);
-        } else {
-                TrackViewList tvl;
+       if (Config->get_edit_mode() == Lock) {
+               error << (_("Cannot insert or delete time when in Lock edit.")) << endmsg;
+               return;
+       }
+       bool in_command = false;
+
+       for (TrackSelection::iterator x = selection->tracks.begin(); x != selection->tracks.end(); ++x) {
+               /* regions */
+               boost::shared_ptr<Playlist> pl = (*x)->playlist();
+
+               if (pl) {
+
+                       XMLNode &before = pl->get_state();
+
+                       if (!in_command) {
+                               begin_reversible_command (_("remove time"));
+                               in_command = true;
+                       }
+
+                       std::list<AudioRange> rl;
+                       AudioRange ar(pos, pos+frames, 0);
+                       rl.push_back(ar);
+                       pl->cut (rl);
+                       pl->shift (pos, -frames, true, ignore_music_glue);
+
+                       XMLNode &after = pl->get_state();
+
+                       _session->add_command (new MementoCommand<Playlist> (*pl, &before, &after));
+               }
+
+               /* automation */
+               RouteTimeAxisView* rtav = dynamic_cast<RouteTimeAxisView*> (*x);
+               if (rtav) {
+                       if (!in_command) {
+                               begin_reversible_command (_("remove time"));
+                               in_command = true;
+                       }
+                       rtav->route ()->shift (pos, -frames);
+               }
+       }
+
+       const int32_t divisions = get_grid_music_divisions (0);
+       std::list<Location*> loc_kill_list;
+
+       /* markers */
+       if (markers_too) {
+               bool moved = false;
+               XMLNode& before (_session->locations()->get_state());
+               Locations::LocationList copy (_session->locations()->list());
+
+               for (Locations::LocationList::iterator i = copy.begin(); i != copy.end(); ++i) {
+                       if ((*i)->position_lock_style() == AudioTime || glued_markers_too) {
+
+                               bool const was_locked = (*i)->locked ();
+                               if (locked_markers_too) {
+                                       (*i)->unlock ();
+                               }
+
+                               if (!(*i)->is_mark()) {  // it's a range;  have to handle both start and end
+                                       if ((*i)->end() >= pos
+                                       && (*i)->end() < pos+frames
+                                       && (*i)->start() >= pos
+                                       && (*i)->end() < pos+frames) {  // range is completely enclosed;  kill it
+                                               moved = true;
+                                               loc_kill_list.push_back(*i);
+                                       } else {  // only start or end is included, try to do the right thing
+                                               // move start before moving end, to avoid trying to move the end to before the start
+                                               // if we're removing more time than the length of the range
+                                               if ((*i)->start() >= pos && (*i)->start() < pos+frames) {
+                                                       // start is within cut
+                                                       (*i)->set_start (pos, false, true,divisions);  // bring the start marker to the beginning of the cut
+                                                       moved = true;
+                                               } else if ((*i)->start() >= pos+frames) {
+                                                       // start (and thus entire range) lies beyond end of cut
+                                                       (*i)->set_start ((*i)->start() - frames, false, true, divisions); // slip the start marker back
+                                                       moved = true;
+                                               }
+                                               if ((*i)->end() >= pos && (*i)->end() < pos+frames) {
+                                                       // end is inside cut
+                                                       (*i)->set_end (pos, false, true, divisions);  // bring the end to the cut
+                                                       moved = true;
+                                               } else if ((*i)->end() >= pos+frames) {
+                                                       // end is beyond end of cut
+                                                       (*i)->set_end ((*i)->end() - frames, false, true, divisions); // slip the end marker back
+                                                       moved = true;
+                                               }
+
+                                       }
+                               } else if ((*i)->start() >= pos && (*i)->start() < pos+frames ) {
+                                       loc_kill_list.push_back(*i);
+                                       moved = true;
+                               } else if ((*i)->start() >= pos) {
+                                       (*i)->set_start ((*i)->start() -frames, false, true, divisions);
+                                       moved = true;
+                               }
+
+                               if (was_locked) {
+                                       (*i)->lock ();
+                               }
+                       }
+               }
+
+               for (list<Location*>::iterator i = loc_kill_list.begin(); i != loc_kill_list.end(); ++i) {
+                       _session->locations()->remove( *i );
+               }
+
+               if (moved) {
+                       if (!in_command) {
+                               begin_reversible_command (_("remove time"));
+                               in_command = true;
+                       }
+                       XMLNode& after (_session->locations()->get_state());
+                       _session->add_command (new MementoCommand<Locations>(*_session->locations(), &before, &after));
+               }
+       }
+
+       if (tempo_too) {
+               XMLNode& before (_session->tempo_map().get_state());
+
+               if (_session->tempo_map().remove_time (pos, frames) ) {
+                       if (!in_command) {
+                               begin_reversible_command (_("remove time"));
+                               in_command = true;
+                       }
+                       XMLNode& after (_session->tempo_map().get_state());
+                       _session->add_command (new MementoCommand<TempoMap>(_session->tempo_map(), &before, &after));
+               }
+       }
 
-                /* no selected tracks - use tracks with selected regions */
+       if (in_command) {
+               commit_reversible_command ();
+       }
+}
+
+void
+Editor::fit_selection ()
+{
+       if (!selection->tracks.empty()) {
+               fit_tracks (selection->tracks);
+       } else {
+               TrackViewList tvl;
 
-                if (!selection->regions.empty()) {
-                        for (RegionSelection::iterator r = selection->regions.begin(); r != selection->regions.end(); ++r) {
-                                tvl.push_back (&(*r)->get_time_axis_view ());
-                        }
+               /* no selected tracks - use tracks with selected regions */
 
-                        if (!tvl.empty()) {
-                                fit_tracks (tvl);
-                        }
-                } else if (internal_editing()) {
-                        /* no selected tracks, or regions, but in internal edit mode, so follow the mouse and use
-                           the entered track
-                        */
-                        if (entered_track) {
-                                tvl.push_back (entered_track);
-                                fit_tracks (tvl);
-                        }
-                }
-        }
+               if (!selection->regions.empty()) {
+                       for (RegionSelection::iterator r = selection->regions.begin(); r != selection->regions.end(); ++r) {
+                               tvl.push_back (&(*r)->get_time_axis_view ());
+                       }
 
+                       if (!tvl.empty()) {
+                               fit_tracks (tvl);
+                       }
+               } else if (internal_editing()) {
+                       /* no selected tracks, or regions, but in internal edit mode, so follow the mouse and use
+                        * the entered track
+                        */
+                       if (entered_track) {
+                               tvl.push_back (entered_track);
+                               fit_tracks (tvl);
+                       }
+               }
+       }
 }
 
 void
@@ -6824,22 +7895,22 @@ Editor::fit_tracks (TrackViewList & tracks)
        }
 
        /* compute the per-track height from:
-
-          total canvas visible height - 
-                 height that will be taken by visible children of selected
-                 tracks - height of the ruler/hscroll area 
-       */
+        *
+        * total canvas visible height
+        *  - height that will be taken by visible children of selected tracks
+        *  - height of the ruler/hscroll area
+        */
        uint32_t h = (uint32_t) floor ((trackviews_height() - child_heights) / visible_tracks);
        double first_y_pos = DBL_MAX;
 
        if (h < TimeAxisView::preset_height (HeightSmall)) {
-               MessageDialog msg (*this, _("There are too many tracks to fit in the current window"));
+               MessageDialog msg (_("There are too many tracks to fit in the current window"));
                /* too small to be displayed */
                return;
        }
 
        undo_visual_stack.push_back (current_visual_state (true));
-       no_save_visual = true;
+       PBD::Unwinder<bool> nsv (no_save_visual, true);
 
        /* build a list of all tracks, including children */
 
@@ -6852,36 +7923,36 @@ Editor::fit_tracks (TrackViewList & tracks)
                }
        }
 
-       bool prev_was_selected = false;
-       bool is_selected = tracks.contains (all.front());
-       bool next_is_selected;
-
-       for (TrackViewList::iterator t = all.begin(); t != all.end(); ++t) {
 
-               TrackViewList::iterator next;
-
-               next = t;
-               ++next;
-
-               if (next != all.end()) {
-                       next_is_selected = tracks.contains (*next);
-               } else {
-                       next_is_selected = false;
+       // find selection range.
+       // if someone knows how to user TrackViewList::iterator for this
+       // I'm all ears.
+       int selected_top = -1;
+       int selected_bottom = -1;
+       int i = 0;
+       for (TrackViewList::iterator t = all.begin(); t != all.end(); ++t, ++i) {
+               if ((*t)->marked_for_display ()) {
+                       if (tracks.contains(*t)) {
+                               if (selected_top == -1) {
+                                       selected_top = i;
+                               }
+                               selected_bottom = i;
+                       }
                }
+       }
 
+       i = 0;
+       for (TrackViewList::iterator t = all.begin(); t != all.end(); ++t, ++i) {
                if ((*t)->marked_for_display ()) {
-                       if (is_selected) {
+                       if (tracks.contains(*t)) {
                                (*t)->set_height (h);
                                first_y_pos = std::min ((*t)->y_position (), first_y_pos);
                        } else {
-                               if (prev_was_selected && next_is_selected) {
+                               if (i > selected_top && i < selected_bottom) {
                                        hide_track_in_display (*t);
                                }
                        }
                }
-
-               prev_was_selected = is_selected;
-               is_selected = next_is_selected;
        }
 
        /*
@@ -6930,7 +8001,7 @@ void
 Editor::start_visual_state_op (uint32_t n)
 {
        save_visual_state (n);
-       
+
        PopUp* pup = new PopUp (WIN_POS_MOUSE, 1000, true);
        char buf[32];
        snprintf (buf, sizeof (buf), _("Saved view %u"), n+1);
@@ -6941,7 +8012,7 @@ Editor::start_visual_state_op (uint32_t n)
 void
 Editor::cancel_visual_state_op (uint32_t n)
 {
-        goto_visual_state (n);
+       goto_visual_state (n);
 }
 
 void
@@ -6967,7 +8038,7 @@ Editor::toggle_region_mute ()
 
                (*i)->region()->playlist()->clear_changes ();
                (*i)->region()->set_muted (!(*i)->region()->muted ());
-               _session->add_command (new StatefulDiffCommand ((*i)->region()->playlist()));
+               _session->add_command (new StatefulDiffCommand ((*i)->region()));
 
        }
 
@@ -7064,10 +8135,12 @@ Editor::toggle_midi_input_active (bool flip_others)
                        onoff = !mt->input_active();
                }
        }
-       
+
        _session->set_exclusive_input_active (rl, onoff, flip_others);
 }
 
+static bool ok_fine (GdkEventAny*) { return true; }
+
 void
 Editor::lock ()
 {
@@ -7076,38 +8149,35 @@ Editor::lock ()
 
                Gtk::Image* padlock = manage (new Gtk::Image (ARDOUR_UI_UTILS::get_icon ("padlock_closed")));
                lock_dialog->get_vbox()->pack_start (*padlock);
+               lock_dialog->signal_delete_event ().connect (sigc::ptr_fun (ok_fine));
 
                ArdourButton* b = manage (new ArdourButton);
                b->set_name ("lock button");
                b->set_text (_("Click to unlock"));
                b->signal_clicked.connect (sigc::mem_fun (*this, &Editor::unlock));
                lock_dialog->get_vbox()->pack_start (*b);
-               
+
                lock_dialog->get_vbox()->show_all ();
                lock_dialog->set_size_request (200, 200);
        }
-       
-#ifdef __APPLE__
-       /* The global menu bar continues to be accessible to applications
-          with modal dialogs, which means that we need to desensitize
-          all items in the menu bar. Since those items are really just
-          proxies for actions, that means disabling all actions.
-       */
-       ActionManager::disable_all_actions ();
-#endif
+
+       delete _main_menu_disabler;
+       _main_menu_disabler = new MainMenuDisabler;
+
        lock_dialog->present ();
+
+       lock_dialog->get_window()->set_decorations (Gdk::WMDecoration (0));
 }
 
 void
 Editor::unlock ()
 {
        lock_dialog->hide ();
-       
-#ifdef __APPLE__
-       ActionManager::pop_action_state ();
-#endif 
 
-       if (ARDOUR_UI::config()->get_lock_gui_after_seconds()) {
+       delete _main_menu_disabler;
+       _main_menu_disabler = 0;
+
+       if (UIConfiguration::instance().get_lock_gui_after_seconds()) {
                start_lock_event_timing ();
        }
 }
@@ -7121,8 +8191,9 @@ Editor::bring_in_callback (Gtk::Label* label, uint32_t n, uint32_t total, string
 void
 Editor::update_bring_in_message (Gtk::Label* label, uint32_t n, uint32_t total, string name)
 {
+       Timers::TimerSuspender t;
        label->set_text (string_compose ("Copying %1, %2 of %3", name, n, total));
-       Gtkmm2ext::UI::instance()->flush_pending ();
+       Gtkmm2ext::UI::instance()->flush_pending (1);
 }
 
 void
@@ -7136,12 +8207,13 @@ Editor::bring_all_sources_into_session ()
        ArdourDialog w (_("Moving embedded files into session folder"));
        w.get_vbox()->pack_start (msg);
        w.present ();
-       
+
        /* flush all pending GUI events because we're about to start copying
         * files
         */
-       
-       Gtkmm2ext::UI::instance()->flush_pending ();
+
+       Timers::TimerSuspender t;
+       Gtkmm2ext::UI::instance()->flush_pending (3);
 
        cerr << " Do it\n";