This is a direct copy of the logic switching scheme from the original Mesa FU-3 foot controller for the MKIV in a much more pedalboard-friendly format than the original.
Functions exactly the same but takes a detachable 6-pin XLR cable (https://btpa.com/MIC-XLR/4-5-6-7-Pin-XLR/xlr6-sc-xx.html)...
