From time to time I watch additional material on DVDs I've bought chronicling the remastering of the film's video and audio. The audio remastering portion usually mentions something like "We were unable to find the dialogue masters for the film so we had to use the composite audio tracks for those sections of the film" but then in other portions mention "we had access to the music and sound effects tracks and original soundtrack masters". My question is simple: If they have a composite audio track with all the elements (music/effects/dialogue) and a separate music and effects track, isn't there a way to simply subtract the music and effects track from the track that includes the dialogue? I know some of you are going to say that there will always be a problem with phasing and/or problems with the fidelity of both tracks having to match completely, but I have a hard time that in this day and age to believe that there are no processes that can "adjust" two tracks to "match" each other. If enyone can enlighten me I'd sure appreciate it.