I'm not home right now, so i can't really test it, but does this beta branch fix the audio issue? If not, what can i do?
The audio issue happens because the game’s audio files are numbered and NTT copies these as-is, but the order can change between game/GameMaker versions, so installing NTT on top of a game version that’s too old or too new can cause mind-boggling effects with different sounds playing instead of the ones you would expect.