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9 <section id="mixer-window-mixer-strips">
10 <title> Mixer Strips </title>
12 Each track and bus is represented in the mixer window by a <emphasis>mixer
13 strip</emphasis> that contains various controls related to signal flow.
14 There are two places in Ardour in which you can see mixer strips. The mixer
15 window is the obvious one (and the one we deal with here), but you can also
16 view a single mixer strip in the editor window by clicking the
17 <guibutton>editor mixer</guibutton> button.
21 <imagedata fileref="images/mixerstrip.png"/>
25 this image needs replacing with labels and better resolution The mixer strip
26 for a bus is essentially identical to the one for an audio track, but it is
27 missing certain controls that make no sense - you cannot record into a bus,
28 so there is no record enable button, for example.
32 The mixer strips are designed to visually model signal flow. The input
33 button selects the input of the track that this mixer strip monitors. The
34 outputs of the track (the 'tape recorder') are 'hard-wired' to the inputs of
35 the mixer strip. Think of the input to the strip starting at the polarity
36 switch, flowing down through the prefader inserts/plugins/sends section,
37 through the gain fader, past the postfader inserts/plugins/sends section,
38 the panner, and out through the output selector. In the case of a bus, there
39 is no 'tape machine' inserted between the input selector and the actual
40 input of the strip, but the signal flow is identical otherwise.
43 <section id="mixer-strip-narrow-strip-button">
44 <title>Narrow Mixer Strip Button</title>
46 the button on the top left of the mixer strip is labelled with two arrows
47 separated by a line. Left clicking this button will reduce the horizontal
48 size of the mixer strip. Clicking it again will restore the previous size.
49 The first click also has the effect of shortening the names of controls.
50 Plugin lists become very small in this mode, however more faders are
51 accessible without scrolling. Your needs may vary, hence the existence of
56 <section id="mixer-strip-hide-button">
57 <title>Hide Button</title>
59 The button opposite the <emphasis>Narrow Mixer Strip Button</emphasis>
60 hides the mixer strip from view. this button has no effect on signal flow
61 or muting. When a mixer strip is hidden, it's entry in the strips list is
62 darkened. To restore the mixer strip to the visible state, click it's entry
63 in the strip list with the left mouse button.
67 <section id="mixer-strip-track-name">
68 <title>Track Name</title>
70 The track name displays the current name of the track as displayed in the
71 editor window. right-clicking on the name brings up a drop-down menu that
72 allows you to rename, activate, deactivate and remove the track. Selecting
73 <guimenuitem>Rename</guimenuitem> opens a new window displaying the name of
74 the track. to change it, type your change and press ok. to leave it
75 unaltered, press cancel. Selecting <guimenuitem>remove</guimenuitem> opens
76 a new window asking for confirmation of your track removal request.
77 removing a track removes that track from the project. If the playlist used
78 by the removed track is not used by any other track, it will also be
83 <section id="mixer-strip-group-button">
84 <title>Group Button</title>
86 The group button displays the name of the currently selected mix group. if
87 no group is selected, it will read no group. when clicked, a drop-down menu
88 appears which lists the current mixer groups, along with the option no
89 group. if a group is selected, any fader movement on one of the group
90 member faders will be translated to the other members of the group.
94 <section id="mixer-strip-input-selector">
95 <title>Input Selector</title>
97 The input selector allows you to assign hardware or software inputs to the
98 track that this mixer strip monitors. clicking on the input box makes a
99 drop-down menu appear which lists ready-made combinations of jack ports,
100 along with the options disconnect and edit. You can either select a preset
101 hardware input combination from the drop-down list, or select
102 <guimenuitem>edit</guimenuitem> to open the input selector window which
103 allows finer control, such as changing the number of inputs to the track or
104 using software devices as inputs. For more information on this window, see
105 <xref linkend="sn-other-windows"/>. <guibutton>Disconnect</guibutton>
106 removes all input assignments while leaving the number of ports untouched.
110 <section id="mixer-strip-polarity-button">
111 <title>Polarity Button</title>
113 The polarity button, when pressed, inverts the phase of the signal as it
114 leaves the track and enters the mixer strip. it has no effect on the signal
115 being recorded to disk. It has no effect on the timing of the signal,
120 <section id="mixer-strip-solo-button">
121 <title>Solo Button</title>
123 The solo button puts the mixer strip in solo mode. the solo indicator in
124 the editor window will flash if any mixer strip is set to solo, and only
125 those tracks that are set in solo will be routed through the system.
129 <section id="mixer-strip-mute-button">
130 <title>Mute Button</title>
132 The mute button mutes the output of the mixer strip.
136 <section id="mixer-strip-track-speed-control">
137 <title>Track Speed Control</title>
139 The track speed allows a varispeed setting to be applied to the track. a
140 setting of <literal>1.0</literal> corresponds to the normal playback speed
141 of the session. a setting of <literal>0.5</literal> will play at half
142 normal playback speed. when altered, the track will be redrawn to reflect
143 the new position of the audio resulting from the speed change. The Track
144 Speed Control has three decimal places of precision. A left or right click
145 on the displayed number will raise or lower the track speed by 0.1%. when
146 the speed is not exactly 1, the display will be coloured red. Hovering over
147 the displayed number will allow you to use the mouse wheel to set the
148 desired speed. A middle click on the displayed number will return the speed
155 <section id="mixer-strip-record-enable-button">
156 <title>Record Enable Button</title>
158 The record enable button arms the track for recording. pressing this will
159 change the way you monitor and meter the selected input signal depending on
160 the state of the monitoring settings in the options editor, as well as the
161 auto input setting in the editor.
165 <section id="mixer-strip-automation-mode-buttons">
166 <title>Automation Mode Buttons</title>
168 The automation mode buttons allow you to select a fader or pan automation
169 mode from a drop-down list. see <xref linkend="sn-automation"/> for more
170 information about automation modes.
174 <section id="mixer-strip-redirect-boxes">
175 <title>Redirect Boxes</title>
177 These dark areas above and below the fader allow you to place inserts,
178 sends and plugins into the signal path before and after the fader
179 respectively. you may also easily reorder them whilst playing.
180 collectively, the objects that belong in these boxes are called redirects.
181 If there are redirects present in the channel, they can be reordered by
182 dragging them vertically. because plugins and inserts can have different
183 numbers of inputs to outputs, sometimes you may reach a situation where the
184 inputs and outputs cannot be all connected sensibly. in this case, your
185 reordering change will be disallowed by the program.
189 Right clicking within the dark area will bring up a drop-down menu which
190 allows you to manipulate the redirects in various ways.
194 <title>Redirect Boxes</title>
196 <term><guimenuitem>new plugin</guimenuitem></term>
199 selecting new plugin will open a dialog which lists the plugins
200 available on your system. selecting a plugin which is compatible with
201 the number of streams in the channel at that point will result in the
202 plugin being placed in the redirect box in an inactive state. this is
203 indicated by the brackets around the plugin name. double-clicking the
204 plugin name will bring up a window that allows you to control the
205 parameters of the plugin statically (including bypass) or using
206 automation. all plugins that report their latency are time-compensated
207 automatically in ardour.
213 <term><guimenuitem>new insert</guimenuitem></term>
216 places at least two new jack ports at that point in the mixer strip (one
217 input, one output). these ports will then be available to any jack
218 client (including Ardour itself), allowing another program (or channels
219 within another program) to be inserted across the channel. hardware
220 ports may also, of course, be used, allowing the insertion of outboard
221 equipment. the insert will then appear in the redirect box in brackets
222 indicating that it is inactive. to activate or deactivate an insert,
223 right-click on it and select activate. double-clicking on the insert
224 will bring up a dialog which allows to to assign its inputs and outputs
231 <term><guimenuitem>new send</guimenuitem></term>
234 selecting new send will first bring up a dialog box that enables you to
235 select the number of outputs the send has, along with the destination of
236 each output. closing this dialog will reveal the name of the send in
237 brackets, indicating that it is inactive. to activate the send, right
238 click on it and select Activate. double-clicking on the send brings up
239 the previous dialog, which will now include a fader which is provided
246 <term><guimenuitem>clear</guimenuitem></term>
249 selecting clear in the menu removes all redirects from the mixer strip
250 (pre and post fader). you can remove an individual redirect by holding
251 the shift key and right clicking it.
257 <term><guimenuitem>cut</guimenuitem>, <guimenuitem>copy</guimenuitem>, <guimenuitem>paste</guimenuitem></term>
260 these items allow you to cut, copy and paste plugins, including their
261 current settings, between Redirect Boxes.
267 <term><guimenuitem>rename</guimenuitem></term>
270 selecting rename will bring up a dialog displaying the name of the
271 selected redirect. change the name by typing into the text area and
278 <term><guimenuitem>select all/deselect all</guimenuitem></term>
281 these two options select or deselect all plugins in the channel. this
282 could be used, for instance, in preparation to copy all plugins from a
283 channel to another one, along with the current settings.
289 <term><guimenuitem>activate/deactivate</guimenuitem></term>
292 selecting either of these will activate or deactivate the currently
293 selected redirect(s) respectively. deactivate is the equivalent of
294 <guimenuitem>bypass</guimenuitem>.
298 note that you can bypass a plugin from it's parameter window as well as
306 <term><guimenuitem>activate all/deactivate all</guimenuitem></term>
309 selecting either of these will activate or deactivate all redirect(s) in
310 the mixer strip respectively. deactivate is the equivalent of
311 <guimenuitem>bypass</guimenuitem> if you're a plugin.
317 <term><guimenuitem>edit</guimenuitem></term>
320 selecting edit brings up the controls relevent to the selected redirect.
321 this is the equivalent to holding control and right-clicking on a
322 redirect. note that the right click method will not bring up the
323 controls of the selected redirect, only the one beneath the mouse
331 <section id="mixer-strip-pre-post-input-button">
332 <title>Pre/Post/Input Button</title>
334 This button cycles between three metering modes, which determine which
335 signal is fed to the meters. the modes are pre-fader (the signal at the
336 input to the fader), post-fader and input (the level at the track input).
337 left clicking cycles through the three modes one step at a time, while
338 middle-clicking alternates between the current setting and the setting two
339 steps ahead. this allows one-click direct a/b comparison between all
340 available monitoring points.
344 <section id="mixer-strip-gain-display">
345 <title>Gain Display</title>
347 this control displays the current gain of the fader to the nearest 0.1dB.
348 left clicking on the value will lower the gain by an amount dependent upon
349 the fader position the graduations become smaller as the fader nears 0dB
350 gain. right clicking increases the gain by the same amount. middle clicking
351 resets the gain to 0dB.
355 <section id="mixer-strip-unit-selector">
356 <title>Unit Selector</title>
358 Right clicking on the meter bars allows you to select the range of signal
359 levels displayed by the meters. the selected range will be displayed as a
360 column of numbers next to the meter. /*XXX this feature is currently not
361 working*/ Gain Level Display
365 <section id="mixer-strip-peak-meter">
366 <title>Peak Meter</title>
368 This control displays the highest peak since the last peak meter reset.
369 Resetting the peak meter is achieved by left-clicking the displayed number.
370 The peak meter monitors the signal selected by the <emphasis>Pre/Post/Input
371 Button</emphasis> .. the same signal as the meters. It should be noted here
372 that 0dBfs corresponds a value equal to the maximum input or output level
373 of your audio hardware, independent of it's bit depth.
377 <section id="mixer-strip-gain-fader">
378 <title>Gain Fader</title>
380 The fader changes the signal level within the mixer strip before the
381 post-fader plugins, which are before the output ports. 6dB of gain is
382 allowed. there are several shortcuts available for the fader. Using the
383 scroll wheel of your mouse while hovering above the fader will coarsely
384 change its position. Holding the control key whilst mouse wheeling will
385 give you finer control. Holding the shift key and clicking the fader will
386 reset it to unity gain. Holding control and pressing the middle mouse
387 button whilst over the fader will allow you to bind a midi control to it,
388 provided you have an available midi device set in the options menu.
392 <section id="mixer-strip-meters">
393 <title>Meters</title>
395 The number of meters displayed next to the fader is dependent on the number
396 of inputs or outputs the channel has, whichever is greater. The meters
397 provide a colour-graduated scale from -50 dBfs to +6dBfs. They display the
398 instantaneous value of the signal at the monitoring point selected by the
399 Pre/Post/Input button. 0dBfs corresponds a value equal to the maximum input
400 or output level of your audio hardware, independent of it's bit depth.
401 Exceeding 0dBfs does not correspond to running out of headroom within the
402 mixer, or in any signal path subsequent to that point within the Jack
403 server. It merely means that if that signal is connected directly to a
404 hardware port whose resolution is less than the 32-bit floating point
405 resolution that Ardour uses (i.e. a soundcard), then that port will exceed
406 it's maximum output level, resulting in distortion. hitting 0dB within the
407 mixer (or any point in the Jack server) means that you have approximately
408 100dB of headroom remaining. as it is unlikely that you will reach this
409 point, it is not represented in any special way by the meter. Naturally, if
410 the input is selected as the monitoring point for the meter, exceeding
411 0dBfs means that the input of your a/d converter has clipped.
415 <section id="mixer-strip-panner">
416 <title>Panner</title>
418 The panner in Ardour is actually two panners. Because any mixer strip in
419 Ardour can route any number of streams of audio anywhere, the idea of
420 panning can be a complex one. To allow for the current stereo-centric
421 mainstream world as well as the multi-speaker experimental one, one of two
422 styles of panner will appear here depending on the number of outputs the
423 channel strip has. In the simple case of mono channel input / stereo
424 output, a single panner will be present. The current pan position is
425 represented by a dot (the dot is the audio stream) which lies between the
426 letters 'L' and 'R', which represent the left and right outputs
427 respectively. To change the panning position of the stream, move the mouse
428 while holding down the left mouse button. the dot will follow your mouse
429 pointer. To introduce sudden changes to the pan setting, place the mouse
430 pointer over the desired position and click the middle mouse button. The
431 pan control will immediately snap to the mouse pointer position. The panner
432 may be bypassed by right-clicking the control and selecting
433 <guimenuitem>bypass</guimenuitem> from the drop-down menu. The panner will
434 immediately be bypassed. The increased level you notice when the panner is
435 bypassed is due to the way panning works. It is not a bug. <emphasis>XXX
436 what gain law is used in the panner?</emphasis>
440 In the case of a stereo input / stereo output combination, two panning
441 controls will appear, one corresponding to each audio stream. You can
442 <emphasis>link</emphasis> the controls together in two different ways in
443 this situation, using the direction arrows next to the
444 <guibutton>link</guibutton> button. Panners can be linked to travel either
445 in opposite directions or to maintain a consistent stereo width across the
446 travel of the control. These two modes are represented by the orientation
447 of the two arrows next to the <guibutton>link</guibutton> button, which
448 point in either the same or opposite directions. The
449 <guibutton>link</guibutton> button must be engaged before you can change
450 the <emphasis>link</emphasis> mode. To link all the panners in a mixer
451 strip, left-click the <guibutton>link</guibutton> button, then select the
452 desired link mode by pressing the button marked with arrows.
456 Let's get a little more complicated by adding another output to the mixer
457 strip. From this point onwards, the panning positions are represented with
458 numbered dots on a square field. Orange dots represent the outputs, and the
459 numbered dots represent the streams. the position of the outputs change
460 according to the number of outputs in the strip. This happens in order to
461 allow the most useful arrangement of the available space. At some point,
462 adding an output will cause the outputs to line up from the top left of the
463 panning square towards the centre. this is to allow for the 'multi-speaker
464 big sweep' to occur - where the sound is panned from speaker to speaker
465 around the room in sequence.
469 Don't forget that you can bypass the panner by right clicking and selecting
470 <guimenuitem>bypass</guimenuitem> from the drop-down menu. this may
471 simplify your multi-speaker setup, as often in this type of project panning
472 between all speakers or outputs is not required on all tracks.
476 <section id="mixer-strip-output-selector">
477 <title>Output Selector</title>
479 The output selector allows you to assign the outputs of each mixer strip.
480 left-clicking the output selector causes a ready-made list of output ports
481 to appear in a drop-down menu, along with edit and disconnect options.
482 Selecting <guimenuitem>Edit</guimenuitem> will allow you to change the
483 number of outputs the channel has, as well as select software and hardware
484 ports to route signals to. For more information on the window that appears
485 when you select this option, see the <xref linkend="sn-other-windows"/>.
486 <guimenuitem>Disconnect</guimenuitem> will leave the number of output ports
487 unchanged, but remove all assignments to output ports.
491 <section id="mixer-strip-scratch-pad">
492 <title>Scratch Pad</title>
494 This is the text area below the <guibutton>output</guibutton> button. it
495 allows you to enter any notes that you feel may be relevant to that track.
496 The notes are stored when you save the session.