I don't know if this will fix your problem, but....
DSP LLE is not quite perfect yet (I don't care what the others say, it definitely isn't perfect). So sound effects will play a bit late.
Another thing is that the Vbeam hack screws the sync as well, so disable it if you want the sound effects to be noise-free. I don't know if setting DSound to 32000 Hz makes a difference, but give that a try, too.
DSP LLE is not quite perfect yet (I don't care what the others say, it definitely isn't perfect). So sound effects will play a bit late.
Another thing is that the Vbeam hack screws the sync as well, so disable it if you want the sound effects to be noise-free. I don't know if setting DSound to 32000 Hz makes a difference, but give that a try, too.