I'm new here, so forgive me if I should have posted this in another section, but anyway... I have an issue with a buzzing sound. When I touch the strings, the buzzing reduces significantly, which leads me to believe it needs shielding (there is none that I am aware of) but, when I turn the volume on the bass all the way up and the tone all the way down to one, the buzzing pretty much quits. If I have the knobs in any other position, the buzzing resumes, even when touching the strings. Does this also have to do with the lack of shielding?