I've noticed recently that my special 6 hums and buzzes a lot. I have moved into a new room in the house and I've changed a fair amount of stuff around. i have my amps and pedals on one plug board into one wall outlet. i have my small vocal pa and roland electric kit on another board into another outlet. i notice that if i touch the metal chassis of the special 6 the amp quietens down but comes back when i remove my hand. am i right in thinking this is a ground loop? i have my eye on one of these, which may help: https://www.behringer.com/Categorie...ssors/DI-Boxes/HD400/p/P0387#googtrans(en|en) if anyone has any tips or has solved issues like this i'd be grateful if you could chime in. a noise, annoys..