Controlling Strymon Mobius Tap button with Mastermind

What's the best way to control the tap button on the Strymon Mobius with the Mastermind? Is there a way to do it via midi command, or should I connect a cable to the EXP in on the Mobius and one of the Function switches? Looking for a way to control the Leslie Cab speed on the Mobius.
I tried connecting a cable from Function 1/2 to the EXP in on the mobius. Activated Function 1 button and it controls the tap button on first tap, but patch down on second tap.
Very confusing to me...
 
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