Realtek 3D SoundBack restores audio effects, including surround sound, reverberation, and spatial effects, for legacy game titles when running on Windows Vista.
This software is basically Realtek's version of Alchemy, it'll enable the use of EAX1/2 (we guess A3D, assuming the realtek chips support the decoding) in Vista for games that should support EAX1/2. We have a discussion thread over here on this driver.
Download - click here.
Download: Realtek 3D SoundBack Beta 0.1