Apple Motion 3 - Manual (Page 549)

Chapter 6 Keyframes and Curves 549
The selected interpolation method (Constant in this example) is applied to the entire
curve.
To change the interpolation method for multiple parameters:
1 In the parameter list of the Keyframe Editor, Shift-click to select the parameters you
wish to change.
2 Click the Animation menu (in the Keyframe Editor) and choose a method from the
Interpolation submenu.
The selected interpolation method is applied to all of the selected curves.
Convert to Bezier
Bezier interpolation method is the most flexible, allowing manual modification of the
curve. Motion lets you convert any keyframe into a Bezier keyframe quickly and easily.
To convert a keyframe into a Bezier keyframe:
m While holding down the Command key, drag the keyframe in the keyframe graph.