Hello, I have the same problem with Roland EV-5 expression pedal, which worked with M9 flawlessly. Now I have HX Effects, running on 2.7 firmware.
The expression pedal works fine after turning on the HX, it has good response, works from the minimum to maximum values. I just had to invert it in
global settings. Also pedal position is set to "preset". After changing the preset, the pedal dissapears, it is no longer possible to use it, "learn" function
does not see the pedal etc. Please help it really looks like firmware issue, not the pedal itself.
Greets :)
Mike