Apple Motion 3 - Manual (Page 351)

Chapter 4 Using the Timeline 351
To loop a clip:
1 With the pointer over the end of the clip, press and hold Option-Shift.
The pointer turns into the loop pointer.
2 Drag the Out point of the layer’s bar to the left.
As you drag, the tooltip displays the clip’s In and Out points, Duration, and Loop
Duration. A looped clip has barriers to indicate where loops begin and end in the
Timeline.
The first loop barrier in a clip’s bar is interactive. Moving the barrier changes the point
at which the clip loops.
To change the loop point of a clip:
m Drag the first loop barrier left or right.
The end point of the clip’s loop moves as you drag.
Editing in the Group Track
In addition to the ability to edit individual objects within groups, Motion allows you to
do a variety of editing tasks directly in the object track, even if that track is collapsed.
This allows you to collapse your tracks and do many of the functions typically limited to
a dedicated nonlinear editor such as Final Cut Pro.
First loop barrier