The Line 6 EX1 controller pedal works fine with the H90.

It’s build and looks are clone-like similar to the EV-5 ( I have one), but lacks the volume control on the side.

I know they have different specs internally, but the EX1 works well, and also has a detachable cord, unlike my Boss EV5.

For the record, I also have a white Mission SP-H9 pedal that I haven’t touched yet. When I finally get my board together, that will be on it then.