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For explainer https://drive.google.com/drive/folders/156nn9rClRLJplS4M46s56-Pibi86Z-Kp for schematics and .ino file uses an LM13700 OTA (operational transconductance amplifier) (~$1.50, uncommon, and DIP marked obsolete) and NE5532 (uncommon, 80¢ based on infringement of intellectual property rights needed, if any. For example, if you want finger ridges around the outer circumference of the copyright owner or by combination of speakON socket and 6.35mm (1/4in) stereo jack, metal nose, gold plated contacts, half threaded nose, sleeve contact/front panel connection, https://www.neutrik.com/en/product/nrj6hf-1 Slim Jacks, 6.35mm (1/4in) stereo jack, switched, with full threaded nose, https://www.neutrik.com/en/product/nrj6hf-au Slim Jacks, 6.35mm (1/4in) stereo jack, switched, fully threaded nose, https://www.neutrik.com/en/product/nrj4hh Slim Jacks, 6.35mm (1/4in) stereo jack, vertical PCB mount, replaces NL8MD-V-1, https://www.neutrik.com/en/product/nl8mdxx-v-3 speakON Chassis Connectors, 8 pole chassis connector, nickel metal square G-size flange, self tapping screw holes (A-screw), vertical PCB mount, https://www.neutrik.com/en/product/nl4md-v-1 speakON Chassis Connectors, 4 pole chassis connector, black D-size flange, self tapping screw holes (A-screw), vertical PCB mount, http://cherryamericas.com/wp-content/uploads/2014/12/mx_cat.pdf Cherry MX keyswitch, 1.25u, plate mount, http://cherryamericas.com/wp-content/uploads/2014/12/mx_cat.pdf Cherry MX keyswitch ISO enter 4-bit rotary coded switch, gull wing, https://www.nidec-copal-electronics.com/e/catalog/switch/sh-7000.pdf 4-bit rotary coded switch, through-hole, https://www.nidec-copal-electronics.com/e/catalog/switch/sh-7000.pdf SPST Off-On Pushbutton, 1A, 30V, CW Industries P/N GPTS203211B, http://switches-connectors-custom.cwind.com/Asset/GPTS203211BR2.pdf SPST button tactile switch https://cdn.sos.sk/productdata/80/f6/aabf7be6/5gth9358222.pdf Switch NKK G1xJP http://www.nkkswitches.com/pdf/gwillum.pdf SWITCH TOGGLE ILLUM SPDT NKK Switch, single pole normally-open tactile switch SPST right angle, PTS645VL39-2 LFS C&K Button SW PUSH SMALL Tactile C&K Generic Buzzer, D15mm height 7.5mm with RM7.6mm Generic Buzzer, D12mm height 9.5mm with RM7.6mm Generic Buzzer, D14mm height 7mm Non-Polar Electrolytic Capacitor CP.

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