Changing drum size - Training not Registering

Hey everyone, I’ve mostly used 14" mesh heads and just got a 12" mesh head. When I change the drum setting and go to train SP doesn’t seem to be registering the new drum. I’m seeing a signal coming through but the software is not letting me train the drum for some reason and although I’m getting signal nothing seems to be happening.

Any suggestions?


Hey! Did u hit the unlock button next to the learn button?