The is a demo of the Radio Shack Moog Realistic MG-1 used as audio filter.

via Thalassa77:

I’ve been working on this synth to the last weeks. It’s a Moog Realisitc MG-1 and now after restoration it’s like new or even better because I’ve made few modifications that increase the power and uses of this synth.

I’ve take it off the old RCA connectors and I’ve added and Audio Input to the filter, a Gate Input ( the synth has S-trig ) , and CV Input to control de synth. Also I’ve made a modification to have better signal/noise ratio. With this modifications this synth can be used as filter in your modular system, can be modulated by other synths , can be easyly controlled by MIDI using a normal MIDI/CV conversor ( you don’t need special one with S-trig signal ).