Well, to configure this in H9 Control, click on the Pedal button in H9 Control's bottom menubar, go to General Settings, and then to 'Use Expression Pedal, Aux Switch, or Both, and set that to 'Aux Switch'. Then press the Pedal button again to return to the top level menu and go to Aux Switch Mappings. You'll see there the current Aux Switch mappings. You'll want to disable one of the mappings to free up one of the aux switches. Then you'll want to press the 'Tap Tempo' button, and you can select there which switch you want to have trigger 'Tap Tempo'.
