Yeah, I noticed that too. I think that the best audio plugin for PJ64 is Jabo's directsound. With 1964/mupen64, you can get around this problem by using mupen64's rsp plugin with the "process alists by rsp defined plugin" option and selecting azimer's, and then selecting schibo's audio (comes with 1964) as the actual sound plugin. Somehow, this gives you the quality of azimer's audio with the speed of schibo's audio.