via Raymondscott.com where you will find the full article by Bob Moog."Raymond then brought us into the big room downstairs where he had music synthesis equipment. He had rack upon rack of stepping relays that were used by the telephone company. The relay would step through all positions when dialed. He had them hooked up to turn sounds on and off. It was a huge, electro-mechanical sequencer! And he had it programmed to produce all sorts of rhythmic patterns. The whole room would go 'clack - clack - clack,' and the sounds would come out all over the.place!
Raymond also showed us his "Circle Machine," which was a big disc, and a rotating arm with a photo-cell at the end of the arm. There was a series of lights on the circumference of the disc that this arm would pass over, and you could adjust the brightness of each lightbulb. As the arm swung around, and the photocell was illuminated and got darker, the different sounds would come on and.off."
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