Originally posted by: Belbucus
I would suggest that if there is any way to audition the AC3 audio and the new audio side by side, that it could easily be arrived at by ear.

Womble MPEG Video Wizard is great for this. It's my tool of choice. If you rip the GOUT AC3 file, and place it in audio track one, then place the PCM preservation in audio track two, you can shift the PCM track left/right (you may need to trim a few frames from the start) until it matches the AC3 perfectly. When it does, delete or mute the AC3 file and re-export the WAV. It will be unmodified except for the trimmed/added space at the beginning.

A trick if you have several wav files (e.g. one from each side of the laser disc) ... synchronize each PCM file to the AC3, knowing you may be trimming frames from the start of each file. Then, when they're all in sync, delete the AC3 file and move every other one of the PCM files into track one. Expand each clip to their maximum size and this should essentially handle all your crossfades for you.

Once again, export the new PCM file you've modified and voila, you've got a perfectly synchronized single PCM file for the whole film.