Getting a buzzing sound when the cab is in Flat mode. Isn't present on any of the emulation modes or HF off mode. Only time i don't hear it (when in flat mode) is when i unplug the 1/4" input cable. So i bought a new cable and the buzzing is still there. Doesn't matter whether my instrument is plugged in, my HX stomp is on, etc. Only if the cable is plugged in. The volume knob on the power cab raises and lowers the volume of the buzzing, but adjusting the volume on my Stomp does not.
Is this normal for the PC or is it safe to assume mine is defective and should go back? Note that this is a brand new unit. Just unboxed it.
