About ReSpatializer
An advanced panning, surround sound and spatialization plug-in for VST and Audio Unit formats. ReSpatializer supports up to eight input channels, each of which can be individually panned.

Features include selection of angle, spread and spin for each source, LFE (low-frequency effect) tools, 16 different output formats, and host tempo sync for source rotation. ReSpatializer also provides binaural processing for simulated surround sound through headphones.

Read more: http://www.apple.com/downloads/macosx/audio/respatializer.html