[saltman]

yeah I think you've got it.

basically a .vob file is a .mp2 and .wav usually. you're gonna break it into these elementary streams so you can work on the .wav files with vegas, sf, etc... that can't work with them when they are combined. Then you're gonna have two wav files in vegas, sf, etc. cut out any xtras, etc... to make them EXACTLY the same length with the same start and stop point. This way they will stay exaclty in synch (assuming it was in synch to begin with). If the video is out of synch to begin with there are xtra steps. Once you have your new audio cropped, stretched, etc... you can combine it back with the video into a mpeg2 file (using tmpgenc) which than can be authored with any program. This will allow you to use your new audio without reencoding the video.

that afterdawn link above is the multiplex function of TMPGenc xpress.