So a second slave EDP linked by midi will respond as long as
EDP1 Output (not Thru) is linked to EDP 2 Input.
It doesn't happen via brothersync.
This depends on the ControlSource param.
i.e. both EDPs have
Assuming you're syncing to incoming midi clock you could use the Thru
of EDP1 to connect to EDP2 and an AB switch to route the pedal to either EDP. (and bro-sync) Which would suit what I imagine to be your usual mode of operation.