Yes, you need to map the footswitch to the tap tempo parameter.
You can do this per Program, or Globally.
Use perform mode to map it per Program (Parameter: Tap Tempo, Ctl Source: Aux Switch) – https://cdn.eventideaudio.com/manuals/h90/1.5.2/content/play-modes/perform.html#map-to-external-controllers
Use Global – Pedal Control to map it globally (same parameter and Ctl source as above) – https://cdn.eventideaudio.com/manuals/h90/1.5.2/content/system-menu/global.html
