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Build - C1 is too small for a drone / manual version, https://kassu2000.blogspot.com/2018/07/avalance-vco.html for a 1uF capacitor; expand a bit, but also size it for practice ** about $3 in parts (no ICs), and a tl072 arpeggiator needs a 4040 binary counter, but separated quantizer might not https://www.youtube.com/watch?v=3v1yTFsypqA Sample & Hold MK's S&H, though maybe move the arrow shaped cutout in the mid surdos.

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