Apple Final Cut Pro 7 - Manual (Page 592)

This also works with multiple instances of clips from the same media file on disk. For
example: You have three items in your sequence, all from different parts of the same
media file.
If you move the audio item to the left, so that it overlaps the first video item, out-of-sync
indicators appear. The same happens if you move the audio item to the right.
What if you move all three items so that they overlap, but all are out of sync with one
another? The first two items show out-of-sync indicators relative to one another, and the
third item shows an out-of-sync indicator relative to the item it overlaps.
592 Chapter 40 Linking and Editing Video and Audio in Sync