I just ordered (finally) the Y cable to connect both my GP-10 and GR-55 at the same time. I'll be installing the diodes this weekend. Now I need an external footswitch, but I specifically want to be able to use one switch to activate an assign on both units at once. I'm thinking about the Fishman FC-1, which I would MIDI to the GR-55, no problem. Of course, as I understand, there's no way to connect to the GP-10, and I don't want to mess with a computer/tablet/laptop simply to run a switch to the GP-10.
Here's my question: is it theoretically possible, if the switches on the FC-1 are momentary closed, to run a separate jack off of one of the switches inside the unit and then plug that into the back of the GP-10 while still having that same switch send the MIDI CC value to the GR-55? Or, would there likely be some kind of interference between the two connections?
I know this seems a little far out, but I can't think of a better way to do this with one switch, other than maybe buying a very LARGE footpedal system that has multiple connections. Thanks,