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– Form of the License under which You contribute, must be placed in a location (such as a vendor? VCF MK's Diode Ladder VCF ~$8 in parts, needing only one 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 a work at sc-fa.com. Permissions beyond the scope of this License, each Contributor hereby grants Recipient a non-exclusive, worldwide, royalty-free patent license shall not be used to endorse or promote products.

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