Line 6 Helix Stadium Talk

anyone know how to assign an external switch to a block?
I want to use Stadium Floor on desk and have a couple external foot switches to do things with my feet.
I can get an expression pedal set up in the Control A B jack but trying to set up an external momentary switch and choosing switch a or b doesn't work
just a one button looper control on the floor, seems like it should work but no love
 
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