Hello. Any help would be GREATLY appreciated. Ok, I have a passive warwick corvette fretless. I get a constant humm. I believe it is not any equipment issues other than bass itself. I play it normally with headphones connected to a gt-10, and get the buzz. I tune it to get rid of all effects for just bass itself sound, and still humm. I connect it to amp alone, and still buzz. However, when I rotate the bass and point the pickups down humm pretty much goes away. So is this a shielding problem? And if I do shield it, do I need to do the pickup cavities also? Thank you all.