Apple Final Cut Pro 7 - Manual (Page 593)

Understanding Sync Relationships Between Multiple Linked Audio Items
Up to 24 audio items can be linked to a single video item in the Timeline. As a result,
some complex sync relationships may result if you slip more than one of a clip’s audio
items (for information on slip edits, see
“Slipping Clips in the Timeline” ). These are easily
managed using the same out-of-sync indicators described earlier.
When you create a merged clip, or link multiple items together in the Timeline, the video
item is considered the anchor item to which the sync of all other linked audio items is
compared. If you’re linking audio clip items without a video item, then the topmost audio
item in the Timeline acts as the anchor item.
In the following example, three stereo pairs of audio items are linked to a single video
item.
Moving a single pair of items out of sync results in a single out-of-sync duration, with
out-of-sync indicators with positive and negative durations in both the video and audio
items.
593 Chapter 40 Linking and Editing Video and Audio in Sync