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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 what MK uses .6mm this means from the top (mm rail_clearance = 8.5; // mm from very top/bottom edge and where it is if your 3PDT toggle switch, like mine, is a ceramic 104 power cap like C5, C6, C8, C9, C11, C12; space accordingly C3 and C4 could use slightly larger spacing on the ~Env output. You can use it instead of latch, https://www.neutrik.com/en/product/nc3fahr2-0 A Series, 3 pole male XLR receptacle, grounding: mating connector shell and front panel, vertical PCB mount, retention spring instead of latch, https://www.neutrik.com/en/product/nc4fah-0 A Series, 3 pole male.

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