Apple Motion 4 - Manual (Page 590)

Generate Keyframes Command
Ordinarily, keyframe extrapolation occurs without actually creating any new keyframes.
This lets you experiment with different methods. However, you can convert an
extrapolation method into actual keyframes so you can further manipulate them. This is
done using the Generate Keyframes command. You can choose how many of the
extrapolation cycles you want converted into keyframes. Cycles after the number you
chose are left in the extrapolated state.
Generate Keyframes applied, set to one cycle
Original keyframe graph
Repeat Extrapolation applied
To convert extrapolation data into keyframes
1 In the Animation menu, choose Generate Keyframes from the Before First Keyframe or
After Last Keyframe submenu.
The Generate Keyframes dialog appears.
2 Choose the number of cycles you want to be keyframed.
590 Chapter 10 Keyframes and Curves