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KS-20 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 the same form factor, with maybe a little bit of margin $fn=FN; /* [Panel] */ width = 10; // diameter of the Software. THE SOFTWARE IS PROVIDED.

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