Apple Soundtrack Pro 3 - Manual (Page 222)

4 Drag the right edge of the selection left to shorten the selected area, or drag it right to
lengthen the selected area.
Use the Audio Stretching
tool to shorten or
lengthen the selected
area of the waveform.
Note: You can edit a graphically performed time stretch by double-clicking the action in
the Actions tab. For more information about audio stretching, see
Time Stretch .
When you shorten a selection of an audio file using the Audio Stretching tool in the File
Editor, the empty part of the selection area is filled with ambient noise if an ambient
noise print exists. If no ambient noise print exists, the empty part of the selection area is
filled with silence. Shortening a selection using the Audio Stretching tool does not change
the length of the audio file.
When you lengthen the selection using the Audio Stretching tool, any audio overlapped
by the lengthened selection area is deleted. Lengthening the selection past the end of
the file changes the length of the audio file.
If you hold down the Option key while dragging the selection with the Audio Stretching
tool, the audio following the selection area ripples forward when you lengthen the
selection and ripples backward when you shorten the selection. In both cases, using the
Option key changes the length of the audio file.
Note: Stretching an audio file by a large amount can degrade the sound quality of the
audio file.
For information about stretching an audio file numerically using the Process menu, see
Time Stretch .
Using the Zoom Tool
You can zoom in on a specific part of the waveform display to make precise edits.
Zoom Tool button
222 Chapter 8 Working in the File Editor