8 analog in (Combo XLR/TRS), 2 analog out (TRS), ADAT I/O. Has phantom power, 20db pads, MIDI I/O, headphone out. Standalone functionality as mic preamp. No word clock. The 8Pre has two ADAT optical input ports (and two ADAT output ports) but the second one is only for high-sample rate inputs. With the built-in 8 channels of mic preamp plus 8 more channels on an ADAT input, the 8Pre can record 16 channels. The second ADAT optical input can not be used simultaneously to record 24 channels. Zero-latency monitoring of multiple sources. Comes with AudioDesk software (Digital Performer w/o MIDI).