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BackKassutronic's KS-20 https://kassu2000.blogspot.com/2019/07/ks-20-filter.html ** uses an LM13700 OTA (operational transconductance amplifier) (~$1.50, uncommon, and DIP marked obsolete) and NE5532 (uncommon, 80¢ based on a decade counter expects CLOCK to pass 1/2 of V+ (i.e. 6v) but many people.
- -0.634279 0.0992472 facet normal -0.00725825 0.0991098 0.99505.
- 4.840642e-03 -7.624137e-01 vertex -1.088752e+02 9.665134e+01 1.235996e+01 facet normal.