Apple Motion 4 - Manual (Page 581)

To deform the selection box asymmetrically
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Hold down the Command key and drag any of the corner handles of the selection box.
Each corner handle moves independently of the other three corner handles of the selection
box.
Modifying Curves
Perhaps the most powerful and valuable feature that the Keyframe Editor offers is the
ability to make changes to the curves between the keyframes. Of course, manipulating
keyframes causes changes in the curves, but Motion gives you tools to control the
interpolation and extrapolation of your parameter values themselves.
By using different preset mathematical algorithms or by using manual controls, you can
dramatically alter the impact of your effects.
When you set the interpolation for a curve, you select the keyframe you want to modify.
The method you choose determines the distribution of values through, into, or out of
the selected keyframe.
To set an interpolation method for a keyframe
1 Select the keyframe you want to affect.
The keyframe turns white.
2 Control-click the keyframe to display the shortcut menu.
3 Choose an interpolation method from the Interpolation submenu.
To set an interpolation method on a curve segment
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Control-click the segment, then choose an interpolation method from the Interpolation
submenu.
581 Chapter 10 Keyframes and Curves