[AAR.oner]

i would send it thru yer pre-amp and recapture...to extract the audio from the vob [which you said is AC3, i.e. "lossy"], convert to wav for editing, then re-encode would make it "double-lossy", kinda like taking an mp3, converting to wav, then back to mp3

DVD Lab Pro *might* allow you to adjust audio levels of AC3 files internally, but i've got no knowlege of that program, so...you might check their website or videohelp.com to research more