Apple Final Cut Express HD - Manual (Page 731)

Chapter 50 Adjusting Parameters for Keyframed Effects 731
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5 Release the Option key, then drag each of the opacity overlay segments between
keyframes (or drag the keyframes themselves up or down to the values you want).
 To adjust an overlay segment using the Selection tool, move the mouse so that it’s
directly over an overlay segment. When it turns into the Adjust Line Segment pointer,
drag it up or down.
 To adjust a keyframe using the Selection tool, move the pointer so that it’s directly over
a keyframe. When it turns into a crosshair pointer, drag the keyframe up or down.
Adjusting All Opacity Keyframes of a Clip
You can raise or lower the values for all opacity keyframes in a clip (or multiple clips) at
one time by choosing Modify > Levels (or by pressing Option-Command-L). You can
relatively adjust all opacity keyframes, either up or down, or you can set all keyframes
to a single, absolute level (effectively removing any variations in opacity over time). You
can also use this command to modify audio level keyframes.
Smoothing Keyframes With Bezier Handles
The keyframes of some motion settings and filter controls (but not audio volume levels)
can be smoothed. When you smooth a keyframe, one or more Bezier handles are
“attached” to the keyframe. These handles define the Bezier curve applied to a
parameter’s interpolation from one keyframe to the next. This allows you to modify the
acceleration and deceleration of the change from one keyframe’s value to the next. The
velocity doesn’t cause the effect to happen faster or slower; the overall speed of an
effect is determined solely by the distance from one keyframe to the next.
With the Selection tool, drag a
keyframe (or segment) to
make adjustments.