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See PDF at https://raw.githubusercontent.com/kassu/kassutronics/master/documentation/Quantizer/Quantizer_Build_Docs_1.1A.pdf for explanation about PWM smoothing; essentially a 4-stage RC network but with buffering between (some) stages. Needs 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 0.325742 -0.734373 0.595474 vertex.

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