Apple Final Cut Pro X (10.0.9) - Manual (Page 194)

Chapter 9 Edit audio 194
For effects with more than one parameter, keyframes for the selected parameter appear as
white diamonds, while keyframes for other parameters appear gray.
Keyframes appear as white diamonds for all parameters when you choose All from the effect
pop-up menu. Double diamonds indicate that you added a keyframe for more than one
parameter at that point.
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In the Audio inspector: Position the playhead in the Timeline at the point where you want to
add a keyframe, and click the Keyframe button (or press Option-K).
Keyframe button
Once you add a keyframe, the Keyframe button changes to yellow, indicating that the
playhead currently sits on this keyframe.
When you move the playhead in the Timeline, arrows appear next to the Keyframe button
in the Audio inspector to indicate which side of the playhead has keyframes. To go to the
previous keyframe, click the left arrow or press Option-Semicolon (;). To go to the next
keyframe, click the right arrow or press Option-Apostrophe (’).
Click an arrow to go to the
previous or next keyframe.
5 Add keyframes as needed.
Tip: After you’ve added one keyframe, you can add another automatically by moving the
playhead in the Timeline and then adjusting the effect parameter (or the Volume slider when
keyframing volume) in the Audio inspector.