Apple Soundtrack Pro 2 - Manual (Page 210)

210 Chapter 6 Editing Audio Files
Audio Stretching 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. The range of the Audio Stretching tool is limited
to between 25% to 400% of the length of the original audio.
To graphically time stretch an audio file:
1 Click the Audio Stretching 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.
3 Move the pointer over the right edge of the selection.
The pointer becomes a Stretch pointer.
4 Drag the right edge of the selection left to shorten the selected area, or drag it right to
lengthen the selected area.
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.
Audio Stretching Tool
button
Use the Audio Stretching
tool to shorten or
lengthen the selected
area of the waveform.