EAX (creative), 3D (general) and A3D (aureal) in games?

How would I go about implementing any of the above? I know how to use the 3D sound, but what about EAX and A3D -- which are both used by Half-Life, Unreal, and Quake3?

As a sidenote, to anyone who has an SB LIVE!, LIVE! Value, or PCI512, I accidentally turned on EAX in NORMAL WINDOWS (wierd, eh? :D)! How do I go about turning it back off?

To turn off EAX, just go to AudioHQ and choose Environmental Audio. Just click "All effects off".

Thanks, but actaully I've come to like it.... Thanks anyways.