Apple Final Cut Pro 7 - Manual (Page 124)

124 Chapter 6 Working with Audio
Add markers during playback:
Play the audio track. As the clip plays back, press the M key whenever you want to add
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a marker. You can add markers on the fly this way to mark significant sounds or video
frames. This method works in the Viewer, Canvas, and Timeline, whichever is active.
Remove all audio changes from a clip:
Click the Reset button in the Audio tab to remove audio level and pan changes that
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you’ve made.
Reset button
Remove all markers from a clip:
Choose Mark > Markers > Delete All to delete the markers that you’ve added to the clip.
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