Found the issue, turns out the filepath was way too long (I had the game and files within a labyrinth of like 10 folders) so I tried moving the game to a newer and shorter path and reinstalled there. Worked instantly

Just to be sure : The in game audio control doesn't apply in the main menu (where one char is dancing). Have you check the audio level in game ? I checked, volume sliders aren't the issue. It looks like the game just can't play certain audio files, although I'm not certain on how to go about fixing...

On the main menu, I can hear the music, once in game I can only hear some sound effects (footsteps, prompts, etc). I tried uninstalling and reinstalling, as well as checking online for a fixes on the issue, but I really can't find anything. I'm also kind of certain that the issue isn't an anti-virus...