FEATURES:USB audio adapter - easily add sound to any notebook or desktop computer;S/PDIF optical output provides true 7.1-ch sound;Virtual 7.1 channel surround sound provides home-theater quality surround sound via headphones or stereo speakers;Places speakers to preferred positions without moving actual speakers via Speaker Shifter;Reduces unwanted static and noises from D/A processing;Supports EAX 2.0, A3D 1.0, and Microsoft DirectSound 3D;Easily control your multimedia output by using the integrated volume-up, volume-down, Speaker mute and Microphone mute buttons.  (less)