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BackThe replacement arrives - Wiring 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 front panel. Current design uses six IDC 2×8 connectors with 4 positions D Switch, triple pole double throw K switch dual-pole double-throw spdt ON-ON horizontal MEC 5G single pole double throw, separate symbols