Apple Final Cut Pro 6 - Manual (Page 560)

Chapter 14 Linking and Editing Video and Audio in Sync 227
II
Marking a Clip as In Sync
If you’ve moved a selected clip item out of sync deliberately and you want to
permanently change that item’s sync relationship to its corresponding linked audio or
video items in the sequence, you can use the Mark in Sync command. Final Cut Pro
marks the items’ current relationship in your sequence as being in sync.
If you move one of these items out of sync again, the out-of-sync indicator shows the
number of frames to resync to the new sync point.
Note: Using Mark in Sync does not affect the original master clip in the Browser, nor
does it affect your media file on disk. It only affects the selected clip items in
the Timeline.
To mark out-of-sync clip items as in sync:
1 In the Timeline, select the items that you want to mark as in sync (one video and up to
24 audio items may be marked as in sync).
2 Choose Modify > Mark in Sync.
The items are now marked as in sync, although their positions in the Timeline
haven’t changed.
Out-of-sync indicator.
The out-of-sync
indicators disappear.