I've been out of the world for a spell...
I'm not sure where you are in the AK2 process, but I thought I would work my way through from here.
I think having a pull-down resistor on the board should be indicated in the pinMode() comments
and the having INPUT_PULLUP in pinMode() seems conflicting and counterintuitive; and, while it does seem function with it in there, it also functions with INPUT.
My 2¢
I've been out of the world for a spell... I'm not sure where you are in the AK2 process, but I thought I would work my way through from here. I think having a pull-down resistor on the board should be indicated in the pinMode() comments and the having INPUT_PULLUP in pinMode() seems conflicting and counterintuitive; and, while it does seem function with it in there, it also functions with INPUT. My 2¢