>>536378169
There are a few variations of the required tweaks for the Steam version on ProtonDB, and I never experimented enough to know which exact Proton version is best, but the attached video documents what I personally did to set up the game a while back, and cava shows the audio is working. (I assume "missing audio" means you're getting no sound at all, or no sound in cutscenes, rather than a few easily overlooked sound effects. In other words, all I can say is I don't notice any audio problems on my end.)
I've heard from at least one other anon that he couldn't get it working even with such tweaks, but I don't know why that would be the case, unless the game is really fussy about the exact order in which all the steps are done. This is the Steam version, by the way. I don't know whether the GOG version is any different (or, even if the GOG version is the same, whether using Protontricks with a non-Steam game is straightforward; I've never tried it).
