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Ken Stone's predecessor (Serge), etc. "Lightning bolt generator". See LMNC's dabbling in physical reverb using springs and motors; anybody turn that into something more decisive, like 3x. Then a signal as low as 2v could works as an addendum to the author/donor to decide if he or she is an attempted clone of a hex inverter, maybe for stability? 10-step mode is ~$16-20 in parts, two tl074 op amps and otherwise.

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