: Also, I'm not sure if it's an issue with MCC or if it was like that
: originally, but the sound in both Halo 3 and ODST is borked beyond belief.
: I use A50s, and the sound is just awful. The music is almost unbearably
: loud, and the gun effects and some voices are really quiet. In Halo 3
: (ODST doesn't seem to have the issue), the surround sound isn't even
: location accurate. I don't recall the original games being bad (although I
: do feel like the levels between different things were a bit wonky), but
: it's been so long I don't remember.

It's an MCC issue. Halo 3's audio system is in a much better state than when MCC launched, but the filtering and mixing is still quite odd.