Don, good luck in your search. This may not work out but just in case... The MFC-10 Yamaha multi foot switch is programmable (midi) to do a variety of things. I believe there is a template on the T4 to start with. Perhaps this could be a starting place for your research.

On the T4 press.. Function, Midi, All parts, Edit, tab to MFC10 and there you go. I tried going through the list displayed and it seemed to show all of the regular functions as Midi controllable including Reg.

regards, chuck