Just ran into a rather frustrating problem. Just yesterday, I took all the Star Wars sound mixes I had (1977 mono, 1977 stereo, and 1993 stereo) that were already synchronized to the GOUT (minus the 1985 mix, which I have, but it's unsynchronized) and added the exact amount of delay at the beginning needed to properly sync them up.

I then took the GOUT video track I had in Avid underneath my Revisited/AVCHD track and made sure it lined up perfectly with the beginning, and adjusted the Revisited/AVCHD track accordingly. I then erased the mono mix audio that I'd attempted to manually sync up (with more or less OK results - the YouTube clip makes it look worse than it was, but it still wasn't 100% exact) and replaced it with the new file that I'd added the delay to (which now syncs up 100% perfectly!) ... but the problem is, somewhere along the line the Revisited/AVCHD track becomes one frame out of sync with everything else. Now I have to go through every shot until I find the first one that's off so I can fix it. Ugh.

I think I'll take a break from this for the rest of the day today and come back to it tomorrow to fix this.