Right. The movie-only 1996 Pioneer release had the PCM and AC-3, but an isolated score instead of the commentary.
I just assumed the box set was in CAV. Thanks for clearing that up.
I think it would be worth it to track down, in the (apparently quite likely?) case that it sounds better than the DVD. The score is amazing (and I have always been miffed that the official soundtracks all leave out my absolute favorite part, the opening bars from Don Giovanni that start the film and return as the leitmotif for Mozart's father and the disguised Salieri).