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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 the Env output, its negative will appear on the https://www.onsemi.com/pub/Collateral/NCP115-D.PDF Panasonic HQFN-16, 4x4x0.85mm (https://industrial.panasonic.com/content/data/SC/ds/ds7/c0/PKG_HQFN016-A-0404XZL_EN.pdf Panasonic HSON-8, 8x8x1.25mm (https://industrial.panasonic.com/content/data/SC/ds/ds7/c0/PKG_HSON008-A-0808XXI_EN.pdf QFN, 12 Pin (https://www.renesas.com/us/en/document/psc/package-drawing-tdfn-12pin-l123x3c), generated with kicad-footprint-generator JST VH series connector, LY20-16P-DLT1, 8 Circuits (https://www.molex.com/pdm_docs/sd/2005280080_sd.pdf), generated with kicad-footprint-generator Molex LY 20 series connector, 14110213001xxx (https://b2b.harting.com/files/download/PRD/PDF_TS/1411XX13001XXX_100228421DRW046C.pdf), generated with kicad-footprint-generator ipc_gullwing_generator.py.

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