Apple Motion 4 - Manual (Page 555)

If you press the Shift key while you drag, the keyframe snaps to the edges of other objects.
You can use this same technique to align keyframes from one object to keyframes in
another object. In this way, you can arrange two objects to both fade in or blur into focus
at exactly the same frame. It doesn’t matter whether the objects are in the same group
or not.
To align keyframes of multiple objects
1 Click the Show/Hide Keyframes button in the Timeline.
Any keyframes in the project become visible.
2 Identify the keyframe you want to move.
3 Find the object containing the parallel action.
4 Drag the keyframe in the first object until it lines up with the corresponding keyframe in
the second object.
Aligning Keyframes to Markers
Other objects in your Timeline can also serve as guides for where to move your keyframes.
For example, you may have a music cue or line of narration where you want a particular
effect to end or change.
One great way to do this is to use time markers. Simply identify the important frame with
a marker and drag the keyframe until it lines up with the marker. Markers create snap
points, so pressing Shift while you drag a keyframe makes it snap to markers. To learn
more about setting markers, see
Adding Markers .
555 Chapter 10 Keyframes and Curves