You can add tail leader to the audio or video material in Avid to provide a useful visual reference in the Timeline for tracking and fixing sync breaks across any number of tracks.
Film editors traditionally use standard head and tail leaders for this purpose. You can create your own leader according to any specification, as described in
Creating Leader.
With tail leader added to synchronized tracks, you can go to the end of the sequence after making a complicated edit and see whether the leaders are lined up. If they are out of line, this indicates a sync break that you can measure and eliminate.
As a quick fix, click the Extract/Splice-in button. Drag the black segment at the end of the out-of-sync tail leader to the location where the sync was lost. This segment of black, created when the track went out of sync, is the exact length of the sync break.
