I’m frustrated

Connect hi-hat controller/trigger to Alesis Strike Multipad

How do I connect an external hi hat controller and trigger to the Alesis Strike Multipad? Also, is there away to assign the controller to a pad so that it controls the hi hat sound assigned to a pad? I own a Roland VH-12 as well as a DIY Zildjian L80 hi-hat with a GOe hi hat controller.
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