I had a chance to speak with Rich from Sigsound on Saturday and he told me that he's never replaced a volume potentiometer on a joule LA 100 only a balance potentiometer, he recommended searching on e-bay as well and said he figures that it was wired in parallel and that I could get away with a dual gang either with motor or without motor. I've spoken to a few others who highly recommend cleaning the pot with Deoxit D5 and with tapered electrical swabs really well before purchasing a new replacement , the product I have is cleaner but they said nothing works as good as Deoxit especially if you can get a small swab to fit in the openings and really give it a good cleaning, they've cleaned a lot of different pots and were able to get them to work well as new.
Thx I'll keep you posted once I track down some Deoxit D5 and clean the potentiometer.