4 chained logic gates with stepped and smooth outputs
This module is like a hybrid between the NLC quad logic module and the Sauce of Unce. There are 4 inputs driving chained logic gates (you can choose what logic you want - OR, NOR, AND, NAND, XOR or XNOR by the chip installed). There are 4 gate outputs giving the boolean logic result of the signals on inputs 1&2, 2&3, 3&4 and 4&1. A resistor ladder network gives the stepped output based on what these 4 outputs are doing. From this a S&H circuit with a slew processor gives a smooth output.
https://youtu.be/n4hOQYswQmQ
https://youtu.be/XB8paKrpMUQ
https://www.nonlinearcircuits.com/modules/bools
Available as an assembled Module and as a DIY project.
No info about availability.