Apple Final Cut Express 4 - Manual (Page 615)

Chapter 42 Mixing Audio in the Timeline and Viewer 615
VIII
Changing Audio Levels in the Viewer
You can control the audio levels and placement of sound (pan) in a clip in the Viewer
using the sliders at the top of the Audio tab, the number fields next to the sliders, or
the overlays in the middle of the waveform display area.
Changing Audio Levels While a Sequence Is Playing
You can use keyboard shortcuts to change the audio levels of clips in a sequence
while it’s playing. Your changes affect the clip on the lowest-numbered audio track
whose Auto Select control is enabled. The level of the clip at the current playhead
position is adjusted. Use the following shortcuts:
 Press Control-+ (plus sign) to raise the level by 1 dB.
 Press Control- – (minus sign) to lower the level by 1 dB.
 When you use the shortcut, you hear a brief pause, and then playback resumes
almost immediately.
Audio level overlay
Drag the Level slider to
change the audio level.
Pan field
Level field
Pan overlay