this game is a joke. Cant play this cult game. Im very frustrated with this. Audio doesnt sync tons of glinches and bad framerate...

You should probably check this forum, there are numerous threads addressing different ways to fix the issues, settings you have to tweak here and there.

Though, to be fair, I haven't quite figured out how to get the audio to sync.

Numerous threads and posts are not enough.
Usually I don't ask to GOG, but I'll report them in the end, about this only game I can't play well with..

Unfortunately it seems that good developers (able to program) and good game writers (good at making games) always finish in different companies... :(