You can trim off the silent portions of audio and split audio items into two pieces. These two operations allow you to perform a variety of complex audio editing tasks such as fading the audio volume in the middle of a song and then returning to full volume.
To trim silent portions of audio
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Select the audio elements to be trimmed (see Selecting audio).
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Choose → .
The portion of the audio before the in and after the out points will be trimmed away.
To split an audio item
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Select the audio item to be trimmed (see Selecting audio).
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Position the timeline scrubber to the point at which you want the audio item to be split.
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Choose → .
You will now have two pieces of audio split at the point of the scrubber.