That other user is me
I've assigned the expression pedal input of my ES-8 to a CC on the HX One. My patch is set to call a preset on the HX One via PC and then control one of the parameters via CC
The HX One does not respond to CC data under some conditions
The only way I can get it to work is by changing the HX One to a different preset before I call my patch
If the HX One changes to a new preset via PC when I call the ES-8 patch the expression pedal works
If the HX One is already on the preset in the PC, the expression pedal won't work
There may be more going on but I this is the only way I could get it to work reliably
I have an H9 and a DM-101 on the same board that do not experience this issue
I'm using MIDI channel 8 for what it's worth