Apple Final Cut Express 4 - Manual (Page 613)

Chapter 42 Mixing Audio in the Timeline and Viewer 613
VIII
To add a keyframe to the audio level overlay of a clip in the Timeline:
1 Do one of the following:
 Select the Pen tool in the Tool palette (or press the P key).
 If you’re using the Selection tool, press and hold down the Option key.
2 Move the Pen tool to the point in your sequence where you want to set a keyframe,
then click the overlay to set the keyframe.
To adjust keyframes in the Timeline:
m Place the Selection tool directly over a keyframe, so that it turns into a crosshair pointer.
You can now adjust a single keyframe by dragging it up or down to change its level, or
from side to side to move it forward and backward in time.
The keyframe appears as
a small diamond at the
point where you clicked.