I did plug the EV-5 direct into the H90 to start with way back when and it did also have the digital artifacts on Wah pedal settings, not so much when depressing the pedal slowly but for fast actions.
The chain is simple. MC6 Pro > H90 (channel 1) > HX Stomp (channel 2). And the predefined HX Wah patches all work flawlessly over MIDI.
So I do have a Wah workaround with the HX….but I was wondering mostly what specific patch and range settings on Q-Wah folks are using to get a good Wah simulation going.