Hello! This might get sort of long winded but I think it will help to know the whole story. Anyway, I run a Mesa boogie mark 4 (rackmount) and an rg16. I recently moved everything into a new rack case and when I hooked it all back up exactly how I’ve had it for the past 2 years or so. My channel switching started acting up so I double checked my connections and tried again. While plugging and unplugging the mark 4 side of the cable the connector sparked and then burnt up the low voltage circuit in the amp. So, I take the amp out and have it repaired get the amp back and it’s fine. I also brought the interface cable with me to have that looked at Incase he can see something that I’m not. The channels all switch with the footswitch and the knob on the back. I now go back and try to use the interface cable like I always have and nothing on the amp. When I use the midi controller the lights and everything on the rg16 switch and the board works fine. This leads me to believe that the interface cable might have taken I hit during the short that messed up the amp??? Is there anyway to check that for sure?