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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 the Gate In jack and switching ground contact, horizontal PCB mount, https://www.neutrik.com/en/product/nc4fbh B Series, 5 pole female XLR receptacle, grounding: mating connector shell to pin1 and front panel, vertical PCB mount, http://cherryamericas.com/wp-content/uploads/2014/12/mx_cat.pdf Cherry MX keyswitch 1.00u plate Cherry MX keyswitch 1.75u plate Cherry MX keyswitch, 1.25u, plate mount, http://cherryamericas.com/wp-content/uploads/2014/12/mx_cat.pdf Cherry MX keyswitch 1.00u Matias/ALPS keyswitch, 2.75u, http://matias.ca/switches/ Matias ALPS.

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