Avid HD I/O interface, for digidesign Protools HD-Systems, new genearation of AD/DA converter, 16 channel i/os, three configurations to provide ultimate flexibility: 8x8x8: 8 analog I/O and 8 digital I/O (AES, ADAT, TDIF), newly designed high quality soft-knee analog limiter feature, one free expansion slot available for ADC, DAC or Digital card