24-bit / 48 kHz digital audio processing Zero-latency audio monitoring 2 XLR mic inputs with selectable phantom power 2 balanced 1/4 line inputs with guitar-level switching 2 TRS 1/4 insert; MIDI in and out Balanced 1/4 main output with level control Headphone out with independent level control USB powered for ultra-mobility S/PDIF coaxial digital in/out; sturdy aluminum shell