I'm trying to get rid of the fret buzzing on my bass. Its in the higher frets (12+) and buzzes so much I can hardly hear the note. I can't get the action low without i buzzing. I loosened the truss rod, but that stil doesnt get rid of it and then it also buzzes in the lower frets if I do that. The action is OK at the first 5 frets or so, but at the 12th fret it's too high. Help!