USB virtual 7.1 Channel Sound adapter. Add a Virtual 7.1 Channel Sound to your PC. The USB Vistual 7.1 Channel Sound Adpater is a highly flexible audio interface which can be uses either wich desktop or Notebook systems. It tunrs your stereo speaker or earphones into 7.1 channel environment. Compliant with USB 2.0 Full-Speed (12 Mbps). Keys: Microphone-Mute, speaker-mute, Volume-up, volume-down.