I've already got a plan for the pots using LDR-LED setup.
Bob, you can use LED-LDR with LDR with low ON resistance as switches too. And optical isolation means no ground / voltage swing issues..
I used to epoxy together my own in making mixer consoles..
Maybe...
...I have just about enough of my part of the forest cut and split and stacked to heat the cabin all Winter while I build Arduino stuff 