Audio problems with PJ64 1.6

I'm having some severe problems with project64 audio; all the sounds are somehow laggy and distorted, as if the computer wouldn't have enough performance for the sounds. Videos play perfectly and smoothly but audio somehow "drags behind". I've tried a few different games but they all have the same problem, also changing the settings doesn't seem to help... I had PJ64 1.6 installed on the same computer some time ago and everything worked fine. What might be the problem?

Computer specs:
Win XP
amd athlon xp 2200+ 1800mhz
768MB of ram
Radeon 9600 pro 128MB
Creative Sound Blaster audioPCI 128 sound card
(I also have an integrated VIA AC'97 sound card which I don't use)

Tried that, but it didn't work, the game just ran faster but the sound still lags..

Heres a sound clip if it does any help:
http://files-upload.com/199460/pj64_audio.mp3.html

OK now, changing the audio acceleration doesn't have any effect, but I probably found out the problem: dxdiag says my sound card is emulated and hardware buffering isn't supported. Windows can't use the cards hardware so it uses software emulation and playing project64 audio is so choppy because the software emulation is way too heavy for my poor old computer. (?)
Do you have any advice about how to fix this problem?