You trim audio tracks in the same way as you trim video. You can trim any combination of audio and video segments.

Audio tracks are divided into subframes. There are 100 subframes of audio for every frame of video. When trimming audio tracks gesturally, you can trim on a subframe basis.

To trim audio on a subframe basis:

1. Select Sub-frame Pos in the Timeline preferences.
2. Hold down the Shift key while performing any of the trimming procedures described in Trimming Segments Gesturally.