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Options exist. Single-step button (SW13) isn't producing a high enough voltage to trigger steps. Replace C10 with 100K resistor, and bridge out R44 with a capacitor / resistor pair, see Fireball's hard sync to schematic, laid out PCB with on-board components Add correct footprints to fireball Minor layout tweaks Based on designs from: Skull & Circuits (https://www.skullandcircuits.com/vca-1-2/ Moritz Klein (and derivatives 1 0 22.0001 vertex -2.98805 4.47193 22.0001 vertex 2.98805 4.47193 22.0001 vertex 5.27501 -1.04926 22.0001 facet normal -0.816125 -0.545222 -0.1915 facet normal -0.000107246 0.115912 0.993259 facet normal -0.831552 0.555446 0 vertex 2.07867 1.38893 6.5 vertex -2.3097 0.956708 6.7 vertex -2.07867 1.38893 6.5 vertex -2.5 0 6.5 vertex -0.487725 2.45196 6.5 vertex -2.45196 0.487725 6.7 vertex 2.45196 -0.487725 6.5 vertex -0.956708 2.3097 6.7 vertex -1.76777 1.76777 6.5 vertex -2.3097 -0.956708 6.7 vertex 1.38893 -2.07867 6.7 vertex 0 9.46879 3.54602 facet normal 0.90056 0.423245 0.0992753 facet normal -8.506957e-01 1.781115e-03 5.256555e-01 vertex -1.084234e+02 9.665134e+01 1.113305e+01 facet normal -5.008417e-001 8.586316e-001 1.091305e-001 vertex 3.461637e+000 -2.679382e+000 2.470218e+001 facet normal -0.421912 0.362633 0.830956 facet normal 4.648440e-001 8.134776e-001 3.495343e-001 facet normal -0.0559554 -0.885449 0.461356 facet normal -0.256282 -0.844851 0.469623 vertex -1.73373 8.71606 5.07603 facet normal -4.792344e-001 -8.386599e-001 2.588127e-001 vertex 1.630534e+000 4.844471e+000 2.475471e+001 facet normal -5.741950e-01 -8.187185e-01 3.340390e-04 vertex -1.016764e+02 9.312963e+01 4.255000e+01 facet normal 0.0823699 0.081813 0.993238 vertex -7.39621 -0.0908976 6.86711 facet normal 9.683078e-01 -2.497601e-01 0.000000e+00 vertex -9.778748e+01 9.171995e+01 3.455000e+01 vertex -9.463166e+01 9.225620e+01 2.655000e+01 facet normal -1.087091e-001 -4.840737e-004 9.940735e-001 vertex 4.244207e+000 -8.356673e-001 2.495526e+001 facet normal -3.267694e-001 -5.718470e-001 7.524711e-001 vertex 1.341195e+000 3.939920e+000 2.488700e+001 facet normal -0.0736135 0.0683032 -0.994945 facet normal 0.0868542 0.0464245 0.995139 vertex -6.94785 -2.87789 6.0001 facet normal -4.689671e-01 -3.709757e-03 8.832079e-01 vertex -1.052136e+02 9.725134e+01 9.114063e+00 facet normal 0.64375 0.528267 0.553643 facet normal -0.258274 -0.111484 0.959618 facet normal 0.29018 0.0285785 0.956545 vertex -1.57536 7.91987 5.88782 facet normal -0.0818897 -0.0820711 0.993256 vertex 5.17002 5.22724 6.86195 facet normal 0.000209061 -0.115803 0.993272 facet normal -0.950491 -0.290292 0.11089 facet normal -6.020362e-002 -1.068584e-001 9.924499e-001 facet normal 0.591985 0.205725 0.77925 vertex 6.59163 -0.162663 7.16505 facet normal 1.331864e-01 3.643072e-03 9.910843e-01 facet normal 0.634321 0.772977 -0.011946 facet normal 0.273132 -0.564081 0.779238 facet normal 0.114148 0.990969 -0.0703601 vertex 6.95569 -6.45393 6.1731 facet normal 2.570089e-001 -4.389334e-001 8.609785e-001 vertex -4.165757e+000 2.356711e+000 2.493625e+001 facet normal 8.888848e-01 1.046893e-03 4.581297e-01 vertex -1.082986e+02 9.695134e+01 5.006728e+00 facet normal 0.595624 -0.758286 0.265017 facet normal -7.952300e-001 -6.063079e-001 0.000000e+000 vertex -2.013369e+000 5.249184e+000 1.747200e+001 facet normal -3.318487e-001 5.689139e-001 7.524716e-001 facet normal 0.0822176 -0.0560551 -0.995037 facet normal -5.477259e-002 9.390085e-002 9.940737e-001 vertex -4.261518e+000 2.411432e+000 2.496000e+001 vertex -6.593646e+000 2.467701e+000 1.747200e+001 facet normal -0.954699 -0.292516 0.0546275 facet normal 0.977433 0.186445 0.0993094 facet normal -8.712699e-01 4.908041e-01 -3.185965e-04 vertex -1.036796e+02 1.023805e+02 1.055000e+01 vertex -9.426361e+01 1.053818e+02.

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