Apple Soundtrack Pro User Manual
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Chapter 7
Working in the Waveform Editor
Stretch Tool
You can time stretch all or part of an audio file to change the amount of time it
occupies. When you stretch an audio file, the length of time changes but not the pitch
(letting you fill dialogue, music, or other audio to a specific amount of time). For audio
files with music or other repeating patterns, stretching the file changes the tempo of
the music without changing the key.
To graphically time stretch an audio file:
1
Click the Stretch Tool button above the time display.
2
In the waveform display, drag horizontally across the waveform to select the part you
want to time stretch.
The pointer becomes a Stretch pointer.
3
Drag the right edge of the selection left to shorten the selected area, or drag it right to
lengthen the selected area.
Note: Stretching an audio file by a large amount can degrade the sound quality of the
audio file.
Zoom Tool
You can zoom in on a specific part of the waveform display to make precise edits.
To zoom in using the Zoom tool:
1
Click the Zoom Tool button above the time display.
The pointer changes to a Zoom pointer.
2
In the waveform display, do one of the following:
 Click to zoom in.
 Option-click to zoom out.
 Drag horizontally to select the part of the waveform you want to zoom in on.
The waveform display zooms in on the selected area.
For information on other ways to zoom in and out in the waveform display, see
“
Zooming In and Out in the Waveform Editor
Stretch Tool button
Zoom Tool button