Well, the H9 has pedal functions that can be assigned to MIDI CC messages that increment or decrement the preset without loading it, and there's another pedal function that emulates the active footswitch on the H9 and can be used to load a pending preset. So, this can be done with a pedal that sends out MIDI CC messages, but it doesn't sound like the MIDI Mouse is capable of sending out anything but MIDI program change messages.
