Apple Final Cut Express HD - Manual (Page 616)

616 Part VIII Audio Mixing
Example: Using Keyframes in the Timeline to Automate Audio Levels
Suppose you’ve edited a music clip and a clip with a voice narration together in
your sequence.
There are long pauses between the narrator’s lines, during which you want the music
to be the dominant audio track. So you set the overall level of your music to –4 dB,
since that’s the level at which the audio sounds best between the actor’s lines. When
the narrator speaks, however, you want the level of the music to drop so it doesn’t
compete with the narrator for attention.
If you hold down the Option key (while the Selection tool is selected) and click the
level overlay of the music clip with the Pen tool, you can place groups of four
keyframes at each place where a line is spoken by the narrator:
Keyframes set