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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 either internal or external clock sources cycle between 0v and 5v max // gate out (j4/j10 // clock out (j5/j12 // glide in (sleeve and normal both GND - Gate out (could normal to TP10, optional) - Casc out 2x Toggle Switches, 2pin: all step switches (all go to same bus) - run/stop 2x Pushbutton switches, all 2pin: - all step switches (all go to same bus run/stop 2x Pushbutton switches, all 2pin: - reset Pots, 3-pin: - Glide attenuator (B10k) (join two left pins from below - Clock In - diode to U2-3 Clock In - diode to U2-3 Glide In - U1-13.
- Hand-soldering, 7.1x2.5mm^2 package SMD Crystal Oscillator Seiko Epson.
- Vertex 3.47343 8.29927 3.82299 facet.
- HLE-133-02-xxx-DV, 33 Pins per.
- CL485 Artix-7 BGA, 22x22 grid.