Apple Final Cut Pro 6 - Manual (Page 733)

400 Part III Fine-Tuning Your Edit
At the end of the edit, with the transition finished and the default ending percentage
of 100%, the border of the wipe is all the way to the right, revealing the entire
incoming clip.
You can change the starting and ending percentages for the transition. This is an
excellent way of creating split-screen effects if you plan to export your sequence as an
EDL for import into another editing system. For more information on exporting EDLs,
see Volume IV, Chapter 10, “Importing and Exporting EDLs.”
For example, you can set both the starting and ending percentages to 50 percent. At
the start of the transition, a split-screen effect is created; half of the outgoing clip and
half of the incoming clip are revealed simultaneously and throughout the duration of
the transition.
Near the end of an
edge wipe transition
The start of an edge wipe
transition, where the start
percentage is 50%
The start of the
transition in the Canvas