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OTA, an expensive and rare chip these days ($3/ea on amazon, maybe fakes) VCA MK's VCA Probably a straightforward build: one op-amp, four transistors and some example modules 811ef45c764021f623b8bb59234df1314fce4e91 12V, -12V and ground needed, probably up to 1amp https://www.youtube.com/watch?v=pQKN30Mzi2g - maybe not as efficient as a kind of odd LFO. Known problems 900028d3cf Futura BT font files ... Delete 'Panels/futura medium bt.ttf' Panels/futura medium bt.ttf // 13 SPDT switches 1 rotary switch, 5+ positions 10 LEDs - Consider: 1 simple on/off.

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