After having listened to the 7.1 audio for each of the first six movies, I think all the mixes are faithful to the original sound design without any noticeable modifications. I will say though that the music in TMP was much more prominent than I remember though. Sounded pretty fantastic I thought. Besides the better grain structure, I'm hoping someone can get the director's cuts of II - VI onto a preservation as who knows when they may turn up (if ever) on an official Blu-Ray. As far as sound editing goes, the extra scenes would have to be artificially bumped up to 7.1 to work with the new track.