Controlling the x32 with an X Touch Mini

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Trying to find a way to control volume faders in my X32 Rack using an X Touch Mini. I would prefer to use the USB jack on the X32 but could also go the route of the X32 Edit App. in my MacBook Air or iPad. 
I'm using the x32 as a live PA system that I control while playing keyboards. A tactile knob would be so much more user friendly when a quick volume adjustment is needed. Any advice here? Thanks!    


Rob