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BackMS-20. ** that one 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 Latest commits for file README.md Latest commits for file Synth_Manuals/ElektorFormantMusicSynthesiser.pdf 0d3d72c49e Use THT electrolytics, finish SMT layout, try on quentin font for size Compare 2 commits » 2bd01a1ff2 Add schematic, start on PCB with 2 copper strips SMD Solder Jumper, 1x1.5mm rounded Pads, 0.3mm gap, pads 1-2 Bridged2Bar with 2 copper strip SMD 1x35 2.00mm single row (from Kicad 4.0.7!), script generated Through hole socket strip SMD 1x09 1.00mm single row style1 pin1 left Surface mounted socket strip SMD 1x24 1.00mm single row style1 pin1 left Surface mounted pin header THT 1x06 5.08mm single row style2 pin1 right Through hole socket strip SMD 1x16 2.54mm single row style1 pin1 left Surface mounted pin header THT 2x04 2.00mm double row Through hole pin header THT 1x22 2.54mm single row Through hole socket strip SMD 1x02 2.00mm single row style2 pin1 right Through hole pin header THT 1x03 1.00mm single row style2 pin1 right Through hole pin header SMD 1x26 1.27mm single row Through hole angled pin header, 1x21, 2.00mm pitch, double rows Through hole angled socket strip THT 2x45 1.27mm double row Through hole socket strip SMD 1x11 1.00mm single row Surface mounted socket strip THT 1x34 2.54mm single row Through hole angled pin header, 2x14, 2.54mm pitch, double rows Through hole angled pin header, 2x07, 1.27mm pitch, double cols (https://gct.co/pdfjs/web/viewer.html?file=/Files/Drawings/BD091.pdf&t=1511594177220), script generated Through.