Apple Final Cut Pro X (10.0.9) - Manual (Page 181)

Chapter 9 Edit audio 181
4 Do one of the following:
•
To disable the portion of the component where the noise occurs: Press the V key (or press the
Delete key).
Disabling a selected range mutes all sound within the range.
Note: To unmute (enable) the range, press the V key (or press Command-Z).
•
To adjust the volume within the range: Drag the horizontal control up or down.
Keyframes are automatically created along the adjustment points within the range.
5 Play back the clip to listen to your adjustments.
6 To collapse the audio components after you complete your adjustments, choose Clip > Collapse
Audio Components (or press Option-Control-S).