row_2 = working_increment*1 + out_row_1; out_row_5 = working_increment*4 + row_1; //special-case the knob body. [mm] // Bottom radius of the stem. [mm] // Length of the d. Affirmer understands and acknowledges that Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License. Based on designs from: Skull & Circuits (https://www.skullandcircuits.com/vca-1-2/ Moritz Klein (https://www.ericasynths.lv/shop/diy-kits-1/edu-diy-vca/ Two voltage-controlled amplifiers Two CV inputs for each, allowing.