GP4 and Hercules Fortissimo III

Hi,

I got the latest patch on and the new GPxPatch. I just got this Hercules Fortissimo III card and im having some probs. I get cutting of sound (when run in 3d snd and EAX) but in just 2d it does not do this. I really want 3d and eax on because otherwise the sound is crap. Ive even wiped my system and got the latest drivers but no joy. Is this a bug with GP4??
It does not seem to do it whilst in the cockpit . Im confused. Help very much appritiated

Thanks