Hi I've got my rack gear set up guitar into my line6 G55 wireless then into my Korg PitchblackPro tuner then into my Hartke HA5500 head. Every time I press the mute button on the tune I get a loud pop. Is there any way I can stop this? All the cables are fine. And I don't get the pop when I take the tuner out of the chain and put it in the fx loop.