M-Audio today announced the Revolution 5.1 high-definition surround sound card for PCI-based Windows and Macintosh computers. The card is built upon the same architecture as Revolution 7.1, and offers gaming technologies, such as EAX, OpenAL, A3D, DirectSound and Sensaura, built-in to the card, allowing 3D audio positioning and realistic environmental simulation. The new card also offers 5.1 surround sound, a 24-bit/96kHz 1/8-inch stereo line input for recording music, and an 1/8-inch direct microphone input. The Revolution 5.1 sound card carries an MSRP of US$99.95 and is shipping now.