Multiclip Playback
This option allows you to watch all angles of multiclip play at once in the Viewer while
you switch or cut in real time. When this option is selected and you choose Open from
the Playhead Sync pop-up menu, multiclips in your sequence are automatically opened
in the Viewer, and all angles play back at the same time while the active angle plays in
the Canvas. For more information, see Volume II, Chapter 16, “Working with Multiclips.”