Graphite Distortion = Six 100k Trim Pots?

I can't even think of 6 resistors you'd wanna tweak in this thing. Definitely socket the 4069 because some are noisy and you want to be able to swap them out. This is one place where literally any JFET will work, no matching req'd. They're basically being used as very low leakage diodes. Also, D100 can be any diode.
 
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