In Game Audio sounding flat/off-key

[glitteringcosmos]

I've been having issues with the audio in game lately. It started with the voices during cutscene sounding muffled, so I adjusted the BGM audio. Now the music and all sound effects sound flat. I have a Razer headset (I believe it's the Kraken, I know it's not the Nari). I even bought that Immerse Gamepack to see if that would help and it definitely did not.

What is going on, and how do I fix it?

EDIT: I'm attempting a fresh install of the game. I've tried adjusting every setting I can think of on my PC, I've tried using different headsets on different ports, and it's ONLY FF that's affected. Music players/iTunes/YouTube are all unaffected. I'm near tears at this point. The audio distortion is so bad it's nigh unplayable bc everything sounds like it's a fun-house horror situation.