I bet you're having vsync issues which is allowing the audio to desync when you hit tab. I'll try to reproduce that.
Edit: Nope. You're having problems I cannot reproduce artificially. Even with vsync + frame limiter off + max framerate at 60, I do not desync on the opening. I know something wrong's going on.
Edit: Nope. You're having problems I cannot reproduce artificially. Even with vsync + frame limiter off + max framerate at 60, I do not desync on the opening. I know something wrong's going on.
