since i started this thread, thought i'd chuck in my pennyworth again
There is a distinct difference with some gain settings to others, and i use a wide range of guitars, from humbucker mounted PRS and les paul, to P90 hamer and single coil tele, all of them to a lesser and greater degree, have this interference
I have a bought a mains pack filter, and changed guitar leads, and gone round the house turing all possible signal interference off, still there
not blaming kemper per se, and its not a deal breaker, the unit is far too good to let go, but with valve amps never had this, continue to try and find a solution, it does go when my picking hand is on the guitar strings, what does that mean?