Suspiria (1977)

Too many awful changes to list in the 5.1 mix. The original 4-track mix has never been released on home video, which is a shame because it’s supposedly one of the 'great' multichannel mixes. A 2.0 downmix of it is available on the LaserDiscs, and the Japanese LaserDisc is apparently the best.

To summarise:
- The music in the original mix is intentionally very LOUD and is meant to knock the wind out of you; yet, it’s sometimes barely audible on the remix, where it’s usually overpowered by sound effects and dialogue (both of which are often missing throughout the film).
- Missing music: The track “Whispers and Sighs” is completely missing from the remix just before the first murder
- I’m sure there are many more. I haven’t the time to compare, and I’d recommend just waiting for Synapse’s (hopefully definitive) restoration