Puggo - Jar Jar's Yoda said:
It should be easier than syncing with the 16mm audio though (ironically), because capturing the 16mm sound involves a warbly old analog machine. The frame-by-frame video capture is solid time-wise, but the audio is captured separately on a completely different machine in real-time.
Hmm, maybe that explains my trouble getting the THX audio in sync with the 16mm footage you sent me.