This CMU-800R is fully functional and in excellent condition. It also features a MIDI interface with DIN Sync output from Beatnic.jp/ The MIDI interface makes this a breeze to use as each channel just accepts incoming MIDI on the corresponding MIDI channel. IT also features CV/Gate out per channel and can function as a multichannel MIDI to CV interface.
The CMU-800 is a little four-channel mixer with internal preset voices and sequencer software for an Apple II or PC. There is a ribbon cable out the back with a card attached. It features analog synthesis with fixed sounds. Four note polyphony in the chord section, monophonic bass and melody synth sections, and an analog drum section.
The Chord/Melody section has only 1 sound. The drum section is similar to the TR-606 Drumatix, and the bass section is similar to the TB-303 Bassline (some limited adjustments in sound were possible via software). It has separate melody, bass, chord, rhythm, mix outputs. There's also 8 cv/gate outs to run external analog equipment by control voltages, and there's a click in/out. On the face it has knobs for portamento, Melody sustain & decay, Bass decay, and Chord decay. It also has volume level sliders for each of the instruments and a master volume slider. The software uses a similar music programming method as the MC-8 or MC-4.