Apple Motion 4 - Manual (Page 127)

To change the start and end time using the audio track bar
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Select the track in the Audio tab, then drag either end of the audio track green bar (located
above the waveform in the Audio Editor).
Note: You cannot create marked regions for the master audio track.
Changing the Playhead Position in the Audio Editor
There are three ways to move the playhead within the Audio Editor.
To change the playhead position
Do one of the following:
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Drag in the center of the current frame field. Dragging to the right advances and dragging
to the left rewinds.
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Click the arrows on either side of the current frame field to move forward or backward
by one frame.
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Click the current frame field, then type a new number.
Zooming in the Audio Editor
You can zoom in or out in the Audio Editor just as you can in the Timeline or Keyframe
Editor.
The bottom of the Audio Editor contains a zoom slider and a scroller.
To zoom the Audio Editor using the zoom slider
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Drag the zoom slider left to zoom in and right to zoom out.
The Audio Editor updates as you drag.
To zoom the Audio Editor using the scroller
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Click the handle of the scroller and drag it away from the center to zoom out and toward
the center to zoom in.
The Audio Editor updates as you drag.
127 Chapter 2 The Motion Interface