Apple Final Cut Pro 6 - Manual (Page 603)

270 Part II Rough Editing
Switching and Cutting Between Angles
When you work with multiclips in Final Cut Pro, switching and cutting have
distinct meanings:
 Switching: This means changing the active angle of a multiclip without creating a
cut. You can switch the active angle of a multiclip in the Viewer or the Timeline.
Before the switch, the
active multiclip angle is 1.
After the switch,
the active multiclip
angle is 4.