Apple Final Cut Pro 6 - Manual (Page 868)

Chapter 5 Using the Audio Mixer 83
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To mute one or more tracks, do one of the following:
m In the Audio Mixer, click the mute button in the track strip for the track you want
to silence.
m In the Timeline, click the Audio Controls button to display the mute and solo buttons
for each track, then click the mute button on the audio track you want to silence.
To disable mute on all tracks at once:
m Control-click the mute button of any track’s track strip in the Audio Mixer, then choose
Reset All Mutes from the shortcut menu.
To mute the master output:
m In the Audio Mixer, click the Master mute button.
To mute all tracks at once:
m Option-click any selected mute button.
Mute button in
the Audio Mixer
Mute button in
the Timeline
Audio Controls button