MIDI Solutions R8 8-Output MIDI Controlled Relay Array (Standard) The R8 is programmed by sending it MIDI System Exclusive messages Once programmed, its settings are retained even after power is removed Event types are programmable and include Note, Controller, Program Change, and System Exclusive messages (up to 20 bytes) The R8 is MIDI-powered and requires no batteries or power supply to operate A MIDI indicator LED lights up when the product is powered and flashes when MIDI data passes through it