This is a FireWire expansion board, made for specific use with the CME-Pro UF series of Master USB/MIDI controller keyboards, and thereby imparting MIDI and audio workstation functionality to these keyboards. The expansion board features 2 high-quality 24-bit/192kHz line inputs and outputs, an IEEE-1394 FireWire port for connection to external FireWire audio interfaces, a SPDIF coaxial digital I/O, 2 headphone outputs with dedicated volume control, and MIDI In, Out and Thru ports.