void delete_selection();
void delete_note (boost::shared_ptr<NoteType>);
size_t selection_size() { return _selection.size(); }
+ void select_all_notes ();
void move_selection(double dx, double dy, double cumulative_dy);
void note_dropped (ArdourCanvas::CanvasNoteEvent* ev, ARDOUR::frameoffset_t, int8_t d_note);