Hello! I currently live in japan and have a house here. I am noticing some grounding issues perhaps due to the two prong plugs ( I may be mistaken). I have a headphone amp from shciit (killer name!) that has a constant hum in the background of the headphones and when I play my bass humming when I don’t touch The bass ( that I am sure is common and when I Unplug the instrument cable from the amp there is a humming on all my amp. Does any one know what i can do to prevent or make the humming lesson? I am perhaps guessing it could be a ground loop perhaps ? Any one? Thanks !