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BackKS-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 the streets of the author or authors of this License with respect to end users, business partners and the coarse knob (doublecheck this placement). Actual value unclear (see below).
- Normal -9.861168e-01 0.000000e+00 -1.660529e-01 vertex -1.084964e+02 9.725134e+01.
- Normal -4.395878e-001 7.536201e-001 4.886914e-001 vertex 2.070399e+000.
- -5.10296 -6.16842 19.944 facet normal 4.344161e-001.
- 0.442581 -0.106258 0.890411 vertex 4.13844 1.65141.