[saltman]

to my knowledge vegas doesn't recognize .vob files. or .m2v files. It only takes like 5 minutes to demux. you should only be using vegas to lineup/stretch the audio. Then export that new audio. Open tmpgenc back up than remultiplex the two together back into an mpeg2 file, which you can author with TMPGenc DVD author or DVD Architect or whatever else. There are some programs which can read the .vob files. DVDlab and I think Adobe Premiere for instance. It may be possible to open the .vob in those, input your second audio, and reprepare the files using the existing menus... I find DVDLab hard to use but there are people here who know how to use it.