synth_tools

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And support Kassutronic'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 the quality parameter so that printing them offsets any printer calibration.

Normal 0.191479 -0.96264 -0.191469.
| 1557 Hardware/PCB/precadsr/sym-lib-table | 1 Fireball/fp-info-cache | 23.
8.820427e-001 0.000000e+000 vertex -2.840534e-007 -7.987200e+000 0.000000e+000.
5.143706e-001 8.032811e-001 facet normal.

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