In my Vista Setup, I got no significant delay with my AC97, but do happen on Sound Blaster Live, I think there's something to do with Creative.
BTW, I used an OpenAL DLL from Torque, and everything works very fine, you can try to carry your project with that DLL.
BTW, I used an OpenAL DLL from Torque, and everything works very fine, you can try to carry your project with that DLL.