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Package based on ** https://www.instructables.com/Another-MIDI-to-CV-Box-/ yet another version Alternative: CV from something else VCF MK's Diode Ladder VCF Kassutronic's KS-20 VCA MK's VCA Probably a straightforward build: one op-amp, four transistors and some example modules Envelope/Envelope.kicad_pcb | 2 | 1M | Resistor | | 1 | Synth_power_2x5 | 2x5 pin shrouded header 2.54 mm 2x5 Audio Jack, 2 Poles (Mono / TS), Switched T Pole (Normalling) | | | | | | | R30 | 1 | 1 | LED | Light emitting diode, 5 mm x 20 mm fuses; 250V; 10A (http://www.cooperindustries.com/content/dam/public/bussmann/Electronics/Resources/product-datasheets/bus-elx-ds-4426-h15.pdf fuse holder vertical 5x20mm 5 mm Small Signal NPN Transistor, TO-92 2 pin Molex connector 2.54 mm spacing DEF 2_pin_Molex_connector J 0 40 Y N 1 F N DEF SW_Push_SPDT SW 0 40 Y N 1 F N DEF SW_Push_SPDT SW 0 40 Y Y 1 F N DEF SW_DIP_x10 SW 0 20 Y N 1 F N DEF SW_Push_45deg SW 0 0 vertex 2.69268 2.0165 8.90669 vertex 2.57448 2.1934 6.59 facet normal -0.174174 -0.420516 0.89041 vertex 5.38277 1.35267 19.1916 vertex 4.77842 1.16465 18.9636 vertex 4.92823 -0.528226 18.8084 facet normal -7.413586e-01 6.711090e-01 -3.297713e-04 vertex -1.027476e+02 1.036941e+02 1.055000e+01 vertex -9.129413e+01 1.027282e+02 1.055000e+01 vertex -9.259156e+01 1.042646e+02 1.855000e+01 vertex -1.043966e+02 9.730070e+01 3.455000e+01 facet normal 0.366307 -0.925191 0.099203 facet normal 4.493219e-01 -7.207481e-03 8.933408e-01 facet normal -0.0817537 -0.0820584 -0.993269 vertex -3.43619 -3.13874 21.7467 facet normal -0.353597 0.430898 0.830239 facet normal -0.773012 0.634392 0 facet normal 5.080899e-01 -8.613040e-01 -3.436777e-04 vertex -9.390495e+01 9.260618e+01 3.455000e+01 vertex -9.937538e+01 9.198972e+01 1.855000e+01 vertex -9.108914e+01.

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