Canz3D is an audio editor plug-in which processes sound to improve stereo imaging for listening with headphones. It performs a limited simulation of a room with two speakers. The dimensions of the room, it's acoustic properties and many other simulation parameters are adjustable. Canz3D is currently implemented as a VST plug-in for Mac OS. It should work with any VST plug-in compatible audio editor under OS 8.6 and up, including OS X. There are separate classic and carbon, AltiVec and non-Altivec versions.