Mine is working pretty darn good. I use a 3 channel EVH 5150 III and Voodoo Labs GCP/GCX. I run from the GCP into the GCX, GCX to the H9, H9 to a Control Switcher via Midi. I can use my GCP to control my amp channels plus assign H9 presets to each channel on my GCP. It is very cool. Before I was tap dancing during gigs between my GCP, Amp Footswitch, and H9.
The trick is going into the setup mode on the H9 and changing the Mide to “Thru” to control other Midi devices. It comes from the factory default “Thru off”…..at leas it was on mine.