How do I Assign GA pads to my KorgPadkontrol?

I turn on the Hardware Controller
Right-Click Edit/Learn
Tap 16 pads on the PadKontrol.
Once I click the 16th pad, everything disappears!

I want to eventually stop using Battery 4, but the GA setup is a bit tedious.

Also the whole C-2 -> C8 piano thing is too weird for me.