ART USB Dual Tube Pre Two-channel tube-based Mic/Instrument preamp computer interfaceExtremely low noise discrete front end with variable input and output controlsAdvanced optical output compressor to simplify recording and prevent overloadUSB connectivity to desktop and laptop computersS/PDIF output for expanding inputs on digital workstations and computer interfacesLatency free Monitoring Mix and Level controlsBalanced XLR for lo-Z applications and 1/4" hi-Z inputs for instrument DI applicationsSeparate Gain, Phase