I've been running into this problem with both of my main basses. When I plug into my rig on stage, even in places with very clean power, and isolated power outlets, I get that particular kind of noise/hum that is position specific. As in, in one certain position the noise goes away, but when I turn a half inch from that position it is quite loud. Separately, I get some hiss from my signal chain, but thats another can of worms considering all thats in the chain. The question is: Are there any devices that reduce/filter that noise? I was wondering if a Palmer isolation box would cut down on this noise or any other buzz/hum coming from shielding issues or ground loops in my signal chain. Mostly it seems, the majority of my noise issues is originating from the instrument, because when I unplug the bass, 80% of the noise goes away. thanks, and sorry for my serious ineptitude when it comes to understanding electrical issues.