ADAT optical input 62dB of Mic gain, -130.5 dBu EIN Up to 4 independent, near-zero latency foldback (headphone) mixes from the software mixer 192kHz/32bit converters with >120dB of dynamic range and a maximum operating level of +24dB Built in talk-back microphone and a comprehensive monitoring system with 3 months access of SSL Complete plug-in suite