Adobe AUDITION 3 User Manual page 205

Time stretching audio clips
Time stretching lets you change the length of an audio clip without changing its pitch. This technique is particularly
helpful for fitting audio clips to video scenes or layering clips for sound design. You can quickly time stretch a clip
either by dragging or setting time stretch properties. When you time stretch by dragging, Adobe Audition analyzes
a clip's contents and attempts to select the most natural sounding time-stretch method. When you set properties for
time stretching, you can specify which method of time stretching to use.
Like other features in Multitrack View, time stretching is nondestructive, so you can disable it at any time.
Note: Time stretching changes the tempo of a clip. If you time stretch a loop-enabled clip, it won't match the session tempo.
Dragging to time stretch a clip
Time stretch a clip by dragging
Choose View > Enable Clip Time Stretching.
1
2 Select the clip, and then position the cursor over the clip's bottom left or right handle—the time stretch icon
appears.
Drag the handle to lengthen or shorten the clip.
3
To temporarily enter time stretching mode, hold down Ctrl, and drag a clip handle.
Set specific time stretch properties
Select the clip, and choose Clip > Clip Time Stretch Properties.
1
Select Enable Time Stretching, and enter a percentage in the Time Stretch text box.
2
3 Choose one of the following time stretching options from the pop-up menu, set related options, and then
click OK:
Stretches the clip without affecting pitch. This method is most commonly used for melodic
Time-Scale Stretch
instruments, like piano, bass, and guitar. Because this method bases the stretch on the actual length and duration of
the file, use it only to stretch audio that doesn't have well-defined beats, like a synth pad or sustained string section.
Solo Voice/Instrument and Preserve Formant options maintain realism.
Speeds or slows the playback of a clip to fit the new length without maintaining pitch. This
Resample (Affects Pitch)
setting is commonly used in R&B and hip hop to achieve exaggerated stretching and compressing of drum tracks,
creating a lo-fi sound. This setting also works well for vocals, allowing subtle to radical changes in timbre.
Stretches the clip based on beats detected within the file. This setting works only on clips that have very
Beat Splice
sharp, transient sounds, like drums. If the waveform already has beat markers, select Use File's Beat Markers to use
them. Otherwise, select Auto-Find and adjust the default values as needed.
Uses the current Time-Scale Stretch settings when you shorten the clip, and uses the current Beat Splice
Hybrid
settings when you lengthen it.
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