Apple Final Cut Pro 7 - Manual (Page 1111)

The shape of the Opacity parameter’s keyframe graph line leaves the opacity of the top
layer at 50 percent for 1 second, and then the topmost layer fades up to 100 percent,
completely obscuring the clip on track V1.
12 To complete this sequence, fade the topmost layer out again by adding one last keyframe.
Move the playhead to 01:00:06:00, add another keyframe, then change its opacity value
to 0.
Tip: You can also do the above steps using the opacity overlay in the Timeline. For more
information, see
“Example: Keyframing Opacity in the Timeline.”
Example: Keyframing Opacity in the Timeline
There is a faster way to create the Opacity parameter keyframes you created in the previous
example. You do this by adjusting the clip’s opacity over time using the opacity overlay
in the Timeline.
To adjust a clip’s opacity over time using the opacity overlay
1 In the Timeline, edit two clips of equal duration into your sequence.
Note: The clip you want to appear in front should be placed in track V2; the other clip
should be placed in track V1.
Layer the clips, with one clip
in track V1 and the other
superimposed in track V2.
2 Select the Clip Overlays control to display the opacity and level overlays of each clip in
your sequence.
1111 Chapter 67 Adjusting Parameters for Keyframed Effects