ok, here's what I'd like to do:
for a large device, I've got 3-4 different types of pots that I'd like to be able to assign to a foot control. The basic idea is, have a 4-position selector switch (ignore the 3T4P for now) and have it determine which function is on the foot control. My issue is: there are at least 3 different pot values involved: 100k-lin, 100k-log, 10k-log, iirc. Since I doubt I'm going to find a ganged, 3-value, mega-potentiometer...I was thinking of using a CV-type pedal to trigger some sort of programmable resitor device... problems I've run into so far are:
a) most programmable resistors (well, the one or two I've looked into so far) have 256 "positions" which might not be enough to allow for smooth operation, especially when emulating the "log" pots.
b) keeping it simple....so far, the programmable resistors I've found operate on digital input. Almost midi-like Master Clocks and 4 bit control streams and....sheeesh...the support electronics gets ugly fast.
c) My ideal would be to find a chip/system where I could set a couple bits, give it an analog (CV) voltage, and have it present an "analog resistance", i.e. have a smooth varience in resistance as my CV voltage varies.
Is there any pre-designed, known, cookbook-type circuit that I could
plagiarize incorporate into my project?
oh, btw, the project is a Tau Pipe