iMovie HD & iDVD 5: The Missing Manual

Show/Hide Clip Volume Levels

Shift- -L

Show Audio Waveforms

Shift- -W

Nudge an audio clip horizontally

Click clip, then tap left or right arrow (add Shift to move 10 frames at a time)

Scrub audio

Press Option while dragging Playhead

Extract Audio

-J

Paste Over at Playhead

Shift- -V

Lock Audio Clip at Playhead

-L