SWTP Psych-Tone Composer-Synthesizer Vintage DIY Triadex Muse

For your consideration is the extremely rare SWTP Psych-Tone Composer-Synthesizer. The unit seems to work fine, though the output on the internal speaker is very low. The external output works fine.

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The Psych Tone was an early electronic music algorithmic composer and synthesizer presented in the February 1971 issue of Popular Electronics Magazine. It uses a 6-bit , to produce a repeating pseudo-random sequence up to 63 notes long. Three taps are made off the shift register, those are weighted, and summed to drive a Voltage-Controlled Oscillator to produce a pitch. Then an envelope is applied.

The Psych Tone is incredibly rare. It was a complex project, not many people built them, and it is difficult to find a working unit today. And that's a shame, because this was a remarkable device and we can learn much from it. So I recreated the Psych Tone in software, from the schematics, so it can be appreciated.