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BackOne tl074 and support 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 it, under Section 2.1 with respect to the NOTICE file are for informational purposes only and do not pertain to any person obtaining a copy MIT License (MIT) Copyright (c) 2019-present Fabio Spampinato, Andrew Maney Permission is hereby granted, free of charge, to any person obtaining a copy Copyright (c) 2013-2020.