It wasn't Psych-Tone ...which was an elaborate 'Melody Synthesizer' project by Don Lancaster. This much simpler project is what started me off. Popular Electronics called it a 'Music Synthesizer' and I don't think it took up more than one page of the magazine. It was a simple sequencer formed around an RTL 4-bit binary ripple counter. The only relation to Psych-Tone was that I used information from D. Lancaster's RTL Cookbook to extend the sequence from 16 steps to 64 by adding a 3rd dual flip-flop. I also added a dual 2-input gate and wired their outputs thru pots to the 2-transistor "VCO", like 4 of the inverters. The remaining 2 inverters formed the clock. Instead of hard-wiring flip-flip outputs to the inverters and gates inputs, I brought all the Qs and /Qs out to 4-40 screws and selected different combinations of bits with alligator clipleads. My nearly 40+ yr old hand-drawn schematic did not scan well, so I re-drew it. How do you like that 2-transistor VCO? lol. Not shown are switches and capacitors to change the clock rate and pitch range. ALL pots interacted, and now I can see why: there should be diodes in series with the pots on the inverters' and gates' outputs to isolate them from each other. There should also be protection on the EXT CLK input. Perhaps I'll try these minor improvements someday. It's been packed away in a box for I-don't-know-how-long and I recently rediscovered it while looking for something else. I put in two 'D cells and it started beepin' and boopin'! 63K wav

It's NOT dusty. That's the lighting. Yeah, that's it...and crummy webcam resolution. Really.