Hello,

Yes, this expression pedal should work fine with the H9000, it certainly won’t damage anything. If you’re using a TRS cable and set the pedal mode to “expression pedal/1 aux switch”, that should allow you to use both the expression pedal and built-in switch. More info about pedal setup and calibration with the H9000 can be found here: https://cdn.eventideaudio.com/manuals/h9000/content/setup/h9000setup.html#pedals

Let me know how it goes.