4-in / 4-out USB audio interface with studio-quality sound Best-in-class audio quality driven by ESS Sabre32 Ultra DAC Technology Best-in-class speed (ultra-low latency) for host software processing Best-in-class metering for all inputs/outputs with a full-color LCD 2x mic/line/hi-Z guitar inputs on combo XLR/TRS Individual preamp gain and 48V phantom power for each input 2x balanced 1/4-inch line inputs Hardware (direct) monitoring for each input (mono or stereo for inputs 1-2, stereo for inputs 3-4) Monitor mix knob to balance live inputs and computer playback Measured -129 dB EIN on mic inputs 4x balanced, DC-coupled 1/4-inch TRS outputs Measured 120 dB dynamic range on the 1/4-inch balanced TRS outputs 4x RCA (unbalanced) analog out (mirrored) 1x headphone out (driven by ESS converters) with independent volume control MIDI in/out Support for 44.1 to 192 kHz sample rates USB audio class compliant for plug-and-play operation on Mac (no driver required)