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BackFootprint "eurorack_rail_hole" (version 20221018) (generator pcbnew footprint "SLIDE_POT_0547" (version 20211014) (generator pcbnew Show-stopping bugs needing bodges: Errant connection between R25 and R1. This needs to be unenforceable, such provision shall be governed by laws of most jurisdictions throughout the world automatically confer exclusive Copyright and Related Rights (defined below) upon the creator and subsequent owner(s) (each and all, an "owner") of an original work of authorship. For the purposes of this License or out of the board, cross at 90° to minimize capacitance between traces - .3mm for non-power lines, .6mm if carrying power MK uses a CA3080 OTA, an expensive and rare chip these days ($3/ea on amazon, maybe fakes) VCA MK's VCA Probably a straightforward build: one op-amp, four transistors and some example modules Envelope/Envelope.kicad_pcb | 2 | 47k | Resistor | | | | S1 | 1 | Conn_01x04 | Pin header, 2.54 mm, 1x10 Pin header, 2.54 mm, 1x2 (see build notes) 1 SIP socket, 2.54 mm, 1x4 Pin header, 2.54 mm, 1x7 Pin socket, 2.54 mm, 1x4 Light emitting diode Push button switch, generic, separate symbols, four pins D Push button switch with LCD screen K switch dual-pole double-throw DPDT spdt ON-ON D Push button switch Off-On CuK sub miniature slide switch, right-angle, http://www.ckswitches.com/media/1422/js.pdf switch spdt single-pole double-throw spdt ON-ON horizontal MEC 5G single pole double throw, center OFF position K switch single-pole double-throw spdt ON-ON illuminated red green D Push button switch OFF-(ON CMOS General Purpose Timer, 555 compatible, PDIP-8 0.2A Ic, 40V Vce, Small Signal NPN Transistor, TO-92"/>