The DM77 is a clone of the famous drum synth Coron DS8. It’s essentially a VCO associated with an Envelope generator and its VCA. But it can also be used as a simple, almost standalone, synth.
Here’s a quick demo of two DM77 playing the Chase theme by G. Moroder. The purpose of the video is to show the 1V/Octave tracking capabilities of the DM77.