It’s a straightforward modification. This is an unofficial response, but the EV-5 will work. And I don’t think Roland will mind …
That VR2 pot in the schematic below is just the maximum level trim-down pot. It’s not only optional, and unnecessary with the H90’s calibration, but it’s also a PITA feature that I’ve removed from my expression pedals. Too easy to get bumped & moved around.
