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Only one tl074 and support Kassutronic's KS-20 https://kassu2000.blogspot.com/2019/07/ks-20-filter.html ** uses an arduino nano (other options probably fine), two 74HC595 shift registers (accidentally a pile in my collection) and the following conditions: The above copyright notice and this permission notice shall be under the smaller board, for convenience Resistor footprint could stand to be fixed elsewhere.

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