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Version Alternative: CV from something else VCF MK's Diode Ladder VCF Kassutronic's 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 https://www.schmitzbits.de/ms20.html which is licensed under: Copyright (c) 2015-present Aliaksandr Valialkin, VertaMedia, Kirill Danshin, Erik Dubbelboer, FastHTTP Authors Permission is hereby granted, free of charge, to any person obtaining a copy of The MIT License (MIT) Copyright (c) 2011 The Snappy-Go Authors. All rights reserved. Redistribution and use in source and binary forms, with or without Mozilla Public License, Version 2.0, the GNU General Public License, v. 2.0. If a Contributor Version.

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