Apple Motion 4 - Manual (Page 597)

Keyframe Thinning: There are three options of how thinning can be applied.
• Off: No thinning is applied. Keyframes are applied at every frame where the parameter
is changed.
• Reduced: Motion eliminates keyframes that can easily be replaced with a simple curve.
• Peaks Only: Only keyframes with dramatic value changes are recorded.
Don’t record keyframes during playback: When this checkbox is selected, keyframes
are not recorded while the project is playing back.
Record keyframes on animated parameters only: When this checkbox is selected,
keyframes are recorded only on parameters that are already animated.
597 Chapter 10 Keyframes and Curves