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SW15 (once/stop) and cascade out is easier done via skywiring; 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 the number of pins: 13; pin pitch: 5.00mm; Vertical || order number: 1924088 16A (HC Generic Phoenix Contact connector footprint for: MSTBVA_2,5/3-G-5,08; number of pins: 02; pin pitch: 3.81mm; Vertical; threaded flange; footprint includes mount hole.

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