I just picked up a LRbaggs I beam passive pickup and a Behringer ADi20 to put into a 77 Takamine so I could play a solo show tomorrow. The problem I am having is, what I am assuming is 60 cycle hum, is so bad that it is unusable. When I unplug the guitar it goes away. If I turn up the blend knob on the DI it gets worse. Any ideas on fixin this???