I have a Fender Player Plus Strat HSS MN connected to Boss pedals (Boss SD-1, Boss CH-1, Boss DD-8, and Boss IR-2). The Boss pedals are connected to the mixing console via the Boss IR-2. When everything is plugged in, we get a humming noise. What could be causing this? I had the same issue with a Boss Gx-100. I tried an other guitar but still the same. Anyone ??