EDIT:

Problem Fixed

http://img530.imageshack.us/img530/41/configvz0.jpg

try increasing your sound buffer, and make sure nothing is running in the background taking up resources

I don't think this has to do with pSX as it works fine for me but possibly it might be an issue with your computer. You might also want to double check to make sure your hardware is DirectX 9c compatible and has the latest drivers for it installed.

I'm sorry guys, but I fixed this problem awhile ago, I forgot to edit my post notifying that, thanks for the help though.