My strat got loud buzzing/hum/noise but it's gone when i touch the metal parts of the guitar/guitar cord. at first i thought it was bad grounding, but i've resoldered everything and the problem still persist. and now i realized something: 1. I turn on my amp - no buzz 2. I plug in my guitar cord (not plug the guitar yet) - BUZZING 3. I plug the guitar cord in to my guitar - still BUZZING but not as bad as without the guitar. So is this normal to buzz when the cord connected to the amp without the guitar?the buzz is loud.