Apple Motion 4 - Manual (Page 431)

You can convert the behaviors that are applied to all parameters of an object into
keyframes. Converting behaviors that have already been combined with keyframes turns
the sum of all behaviors and keyframes affecting that parameter into a thinned series of
keyframes (a curve with fewer keyframes). This results in a final animation curve that
closely replicates the shape of the background curve that appeared in the Keyframe
Editor. These keyframes can then be edited directly in the Keyframe Editor.
Before After converting to keyframes
For more information on converting behaviors into keyframes, see Converting Behaviors
to Keyframes .
Animating Behavior Parameters
You can animate most behavior parameters in order to change the parameter’s effect
over time. You can animate behavior parameters using Parameter behaviors, or by
keyframing them in the Keyframe Editor.
431 Chapter 9 Using Behaviors