Overview of surround formats in Logic Pro for Mac - Apple Support
Amazon.com: YEY 7.1 USB 3.5MM Sound Card I/O 48KHz sample rate 8CH DAC and 2CH ADC via S/PDIF Input and Output with loop-back support standalone Cmedia software for WINDOWS only : Electronics
Amazon.com: StarTech.com 7.1 USB Sound Card - External Sound Card for Laptop with SPDIF Digital Audio - Sound Card for PC - Silver (ICUSBAUDIO7D) : Electronics