Device: POD HD500X Hi all, hopefully you can help me out. I've recently picked the guitar back up and when I started to use my effects board I found that the foot switches are not performing the correct operations My current foot switch operation mode is ABCD. When i have been pressing down onto FS8 to change patch, it seems to be turning on and off effects instead. after plugging into the edit program on my pc i have seen that FS8 is activating effects placed on FS4. FS4 does not perform any opperations at all. Does the button on FS4 need to be replaced to fix this, or both bottons? Thanks.