Apple Final Cut Pro X (10.0.9) - Manual (Page 182)

Chapter 9 Edit audio 182
Example: Trim audio within an audio component
1 Select a clip in the Timeline, and choose Clip > Expand Audio Components (or press
Option-Control-S).
Audio components
2 Position the pointer at the edge of the audio component you want to trim.
The pointer changes to the Trim tool icon .
3 Drag to trim that section.
The trimmed section is disabled (muting all sound in that section) and appears dimmed in
the Timeline.
To undo your trim, press Command-Z.
4 Play back the clip to listen to your adjustments.
5 To collapse the audio components after you complete your adjustments, choose Clip > Collapse
Audio Components (or press Option-Control-S).