When the H9 is bypassed the expression pedal and MIDI controller are being ignored and the output volume remains set to patch value with no reaction on pedal movements. Did I miss some setting to change this behaviour?
Global volume control, wich remains active in the bypass modeShow More...
You can use an expression pedal or a MIDI controller to control the output volume globally.
I'm guessing you are in RELAY BYPASS mode, in which case the unit is effectively out of circuit. Set it to "DSP BYPASS" if you want it to be active while bypassed.