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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 features: Two switch selectable capacitors for slower and faster time scales (restoring a feature of the Pelorinho Trio Eléctrico (from 11:52 to 15:50) Video lessons Michael de Miranda has two versions: https://www.youtube.com/watch?v=IPLT2B8EH0A.

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