I use a 13 note Solton pedalboard and assign as much as I can to that (stop, start, leslie speed, sustain, breaks, intros, etc). I also use a volume/expression pedal with two ins to control the arranger and volume on a 2nd keyboard (SH-201, GW-7, etc.)-sort of an old two manual B-3 habit.
I have a 7 pedal Solton board I got from Don with a Midjay, but find myself running out of pedals.
the 13 note board tucks into a special pocket on the bag, which was designed for the MS-60, and fits the SD-5. It was secured from Petosa music in Seattle-at one time the primary source for Solton modules and related accordion equipment.
Russ