8 analog in (4 XLR mic, 4 TRS), 8 analog out (TRS), 16 ch optical i/o (16 ADAT at up to 48k, or 8 ADAT at up to 96k, or 2 stereo TOSLink), AES i/o and S/PDIF i/o. Has ADAT sync, word clock i/o, MIDI i/o, headphone out, more. Bus-powered off FireWire for portable field recording, or with external battery pack, or with wall AC. Zero-latency monitoring of multiple sources. SMPTE TC. Works as stand-alone mixer. Comes with AudioDesk software (Digital Performer w/o MIDI).