Cberry1

Has anyone experienced a blooming hum when holding a C or D note on the Helix (or any other modeler)? I have tried everything from eliminating all wet effects to low cuts to trying to find/cut the frequency on an EQ to switching guitars with different pickups, nothing seems to help. It happens live and with headphones. If anyone has experienced this and figured out how to eliminate it, I would love to hear about it.