Hello,

In H9 Control, you can go to Pedal Settings > Tuner and select Mute/Thru in the bottom right corner. This setting should be applied to all presets.

The expression pedal will control the HotKnob/Ribbon Controller. If you like to load a preset and have the HotKnob/Ribbon Controller not change any presets, you can unmap the parameters that are being controller by the HotKnob/Ribbon Controller. In H9 Control, control-click the dot at the end of the light ring around the mapped parameter to unmap it.