Time stretch – Apple Soundtrack Pro 2 User Manual
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Chapter 6
Editing Audio Files
To set the length of the inserted waveform:
1
In the Wave Generator dialog, choose the format you want to use from the Duration
pop-up menu.
2
In the Duration value slider, do one of the following:
 Click the left arrow to shorten the length of the inserted waveform, or click the right
arrow to increase the length.
 Click the center of the value slider, then drag the slider that appears left or right to
change the length of the inserted waveform.
 Click the value in the value slider, then type a new value.
3
Click OK.
Time Stretch
You can time stretch an audio file or selection. When you time stretch an audio file, you
change the duration (length) of the file without changing the frequency (pitch) of the
file. For example, for a file containing music, the tempo of the music is changed, but
not the pitch. When you time stretch an audio file, you can choose the format for time
values you enter.
To time stretch an audio file:
1
Select the part of the file you want to time stretch (it can be the entire file).
2
Choose Process > Time Stretch.
The Time Stretch sheet appears.
3
In the Time Stretch sheet, choose the format for setting the amount to time stretch the
file from the Format pop-up menu.
4
In the “Length of selection” value slider, do one of the following:
 Click the left arrow to shorten the length, or click the right arrow to increase the length.
 Click the center of the value slider, then drag the slider that appears left or right to
change the length.
 Click the value in the value slider, then type a new value.
5
Click OK.
For information on stretching a file graphically using the Audio Stretching tool, see
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