Apple Final Cut Pro 5 - Manual (Page 705)

370 Part III Fine-Tuning Your Edit
3 Choose a ripple or roll edit by doing one of the following:
 Click the left image to trim the outgoing clip with a ripple left edit.
 Click the center area between the images to do a roll edit.
 Click the right image to trim the incoming clip with a ripple right edit.
 Press the U key to toggle between the three available trimming modes.
A green bar appears above either or both sides of the edit to show you what kind of
trimming operation you’re performing.
Trimming indicator bar
only appears above
the outgoing clip.
The pointer temporarily
turns into a Ripple tool.
Trimming indicator bar
appears over both clips.
The pointer
temporarily turns
into a Roll tool.
Trimming indicator
bar only appears
above the
incoming clip.
The pointer
temporarily turns
into a Ripple tool.