pci 24/96 4in 4out (analogs + spdif) + 3 midi; top level preamps & converters, extra low latency, 4 front inputs (both xlr + 48v & jack) plus 2 headphones with independent levels!, and differents in/out on the back, a 10 segments metter (+ a soft one), an intelligent routing and the possibility of mixing the computer return signal with the monitor mix avoids to buy a sound deck! an optional rack offers 8 more in/out.