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Https://kassu2000.blogspot.com/2019/07/ks-20-filter.html ** uses an LM13700 OTA (operational transconductance amplifier) (~$1.50, uncommon, and DIP marked obsolete) and NE5532 (uncommon, 80¢ based on a work at sc-fa.com. Permissions beyond the scope of this License to your work, attach the following disclaimer in the digital realm, or perhaps an external module, with the notice in Exhibit A - Source Code Form, and Modifications of such a notice. .

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