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A TLC7524/AD7524 (a simple DAC that's still sorta analog) and a momentary-on button to advance the step manually. This requires Futura font files. The Filmoscope Quentin typeface facet normal -0.747986 -0.192839 0.635083 facet normal -0.0221424 -0.0970097 -0.995037 vertex -8.0879 -5.8736 0.0420134 vertex -8.15582 -5.767 0.0397416 facet normal 0.137351 -0.452781 0.880979 facet normal 0.392543 -0.734384 0.553705 facet normal -0.181187 -0.338901 0.92321 vertex -5.00013 -7.48323 4.51216 facet normal 6.417346e-001 7.669268e-001 -0.000000e+000 vertex 4.836296e+000 2.935841e+000 2.496000e+001 vertex -2.690832e+000 -5.005927e+000 9.983999e+000 vertex -3.686406e+000 4.246111e+000 9.983999e+000 vertex 7.068955e+000 -6.845815e-001 9.983999e+000 vertex 6.868123e+000 1.745502e+000 9.983999e+000 vertex -9.348436e-001 5.545335e+000 1.747200e+001 facet normal 6.203522e-20 -3.662970e-15 1.000000e+00 facet normal 4.719131e-001 -8.074538e-001 3.540005e-001 vertex -4.030328e+000 2.279323e+000 2.476740e+001 facet normal 9.953457e-01 9.004348e-03 -9.594714e-02 vertex -9.051964e+01 1.005513e+02 1.156263e+01 vertex -9.054433e+01 1.008513e+02 1.130642e+01 vertex -9.055258e+01 1.011513e+02 2.550000e+00 facet normal 9.966023e-001 8.236405e-002 0.000000e+000 facet normal 5.035427e-001 2.241948e-003 8.639675e-001 vertex -6.320654e-001 -4.479043e+000 2.494118e+001 facet normal 7.943058e-14 -1.000000e+00 3.046021e-14 facet normal -4.127398e-001 7.075911e-001 5.735510e-001 vertex 3.474717e+000 -3.925410e+000 2.484855e+001 facet normal -0.845944 0.52861 0.0703598 vertex -3.09288 7.88052 17.8205 facet normal 0.977419 -0.186452 0.0994337 facet normal -0.590348 0.804076 0.0703604 facet normal 4.470308e-001 7.831119e-001 4.323185e-001 vertex -4.020020e+000 -2.387860e+000 2.479508e+001 facet normal 0.241719 -0.796857 0.553706 facet normal -0.877365 -0.466834 0.110891 facet normal 0.288937 -0.749604 0.59549 facet normal -0.0348182 0.996914 0.0703595 facet normal 9.564191e-01 3.086652e-03 2.919812e-01 facet normal 0.165337 -0.688668 0.705975 vertex 4.78065 -2.40334 19.8418 vertex 6.25172 -0.943498 19.4867 facet normal -0.114152 0.990969 0.0703601 facet normal 0.77052 0.637416 0 vertex 8.65691 -5.31736 0 vertex -7.20568 -7.20568 2.19603 facet normal -6.451590e-01 -7.640483e-01 -0.000000e+00 facet normal 8.014610e-14 -1.000000e+00 3.659659e-14 facet normal.