Hi there, first timer here!, well, I'm having recently a weird noise coming from my pedalboard, picture attached, I recently added 2 pedals, one is a hum debugger and the other one a knock out, both from electro harmonix, the thing is, when I start the metal muff there's a big noise in the background even when I'm playing, this happens when using metal muff on its own or combined with another pedal, the noise is like a huge ground noise, when using the other pedals the noise is there but really really low, barely noticeable, another thing is, using my amp, line 6 cab with behringer vtone 1200, that noise with the distortion sounds like a small hum coming from a regular setup, but when I'm using another set of amps, then the big huge and nasty noise amplifies itself, so, not really sure what's going on, maybe something in my line is making noise or something like that? I'm really really ignorant about this sort of things, so, asking tone gurus around here, what do you guys think, by seeing the attached picture, think I'm doing wrong? I'm using a dunlop DC Brick as power unit.

Thanks

Arturo