Yeah you should be able to use Full Acceleration - check your drivers as Perbutabitio says.
Also if you have sound on your motherboard too, as well as your Audigy 2, you might want to try disabling the onboard sound somewhere in the BIOS.
Also if you have sound on your motherboard too, as well as your Audigy 2, you might want to try disabling the onboard sound somewhere in the BIOS.