Heh., well, that might just be the game. This game is buggy as hell. I do know the audio didn't do that with the actual disc though.
I tried the new version (with more memory for the alt dol) and I think it fixed the problem I was having. Actually, I forgot about it, but I was having another problem where some of the visuals in the first scene where it shows your character's girlfriend (before the fish) were black, and then when the fish were shown they scene became normal. Not long after that, the audio got messed up. Neither one happens with this new version. I've only played for a few minutes, but that's longer than the old version went without problems on Red Steel for me.