Hi oortone, these are global input and output volumes. They are not stored on a per preset basis. Using these assignments requires that you have an expression pedal hooked up to a MIDI controller input. That controller must be programmed to send expression CC commands to your H9. In the “Assign MIDI CC” section of your H9, it’s required to assign a CC# to Input Volume and/or Output Volume. The MIDI controller should send those same CC numbers with values of 0 (zero) to 127, off to max volume, across the same MIDI Channel as your H9. I assure you, they work as I have it working in my setup currently. Let me know if you have any questions.