Vintage 1983 Roland DG Compu Music CMU-800R Analog Synthesizer for Apple II

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via this auction

via the seller: "The Roland Compu Music CMU-800R is a four-channel mixer with internal preset voices and sequencer software for an Apple II or PC, built in 1983. There is a ribbon cable out the back. 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

I do not own an Apple II, so I can't test. It does power on. The sliders and knobs are all tight and functioning perfect. It is being sold as-is.

It does not come with the interface card or any software."

Anyone know if the software for this is available online?

Update via James in the comments: "It seems to be possible to MIDI-fy this device" & "More modding possibilities"