Optimal Shop 6 Channel External Sound Card USB 2.0 External 5.1 Surround Sound Optical S/PDIF Audio Sound Card Adapter for PC Laptop Recording Compatible with Windows 8/7/ XP. It supports 32KBz, 44.1khz. (which two need driver or application software support) and 48Khz sampling rate in digital recording, 48KHz sampling in digital/analog audio playback.In digital playback mode, itreceives audio stream form PC via USB interface and transmits audio data according to the AES/EBU, IEC60958, S/PDIF cnsumer interface standards. Only R L channel PCM audio in 5.1 channel can be conveyed in digital playback mode.