About a week ago, I started having a problem with my K&K Bass Master Pro... For some reason, I'm getting no volume out of the quad pick up. The wing pick up worked fine so I figured it was a battery problem, I switched it and had no luck. Next I tried tweaking the trim pots, no change. I've tried several different stereo cables and still no luck. Does anyone have any experience with this problem? Ideas how to fix? Any help would be appreciated. Thanks!