"A Super Simple Three-Mode Simultaneous Input, Variable Resonance, Voltage Controlled Filter For Signal Processing." Nyle A. Steiner, 1970's.
https://www.ka-electronics.com/images/p ... Filter.pdf
Never built one of these. This paper was shown to have been received at MicMix sometime in the 1970's.
Nyle Steiner's Three Mode VCF Paper from the 70's
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