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File uses an LM13700 OTA (operational transconductance amplifier) (~$1.50, uncommon, and DIP marked obsolete) and NE5532 (uncommon, 80¢ based on https://www.schmitzbits.de/ms20.html which is what MK uses a ground plane created pull request 'Finish schematic, add PDF Finish schematic, add PDF Compare 3 commits.

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