The ISA 220 "Session Pack" offers an uncompromised recording channel with a bandwidth of 10 Hz to 150 kHz. The unit includes a mic/line preamp, equalizer, compressor, de-esser and limiter. There is also an optional A/D card available. The mic preamp is the classic Focusrite transformer-based design found in the ISA 110, the Red 1 and the Red 8, the EQ is the same as that found in the original ISA 110 and ISA 215 with the exception that the shelving EQ has four positions rather than six and the compressor and de-esser are the same circuits found in the ISA 430. The unit's digital option, also the same as the ISA 430, provides a high-quality digital route direct from the ISA 220 into a digital recording system.