Apple Motion 4 - Manual (Page 596)

You can simplify your keyframes in two ways: either while you are recording them, or
afterwards, by simplifying an existing animation curve using the Reduce Keyframes
command in the Animation menu for that parameter.
Reduce Keyframes option
(in Keyframe Editor’s
Animation menu) applied
to Position Y
Recording Options
The Recording Options dialog allows you to set the Keyframe Thinning setting, to record
only on parameters that are already animated or to disable recording during playback.
The Keyframe Thinning setting only applies to recording animation while playing back.
This setting has no effect on ordinary keyframing.
To access Recording Options
Do one of the following:
µ
Choose Mark > Recording Options (or press Option-A).
µ
Double-click the Animate button.
The Recording Options dialog appears.
596 Chapter 10 Keyframes and Curves