I just got a custom made 6-String bass with EMG BQS electronics. It was distorting on the B-String so I decided to add another battery to bring the Voltage up to 18V. When I got the battery installed the whole thing quit working. Fresh batteries, clean soldering... That's not the problem. I took the nuts off the front of the potentiometers to take a look and it started working! Finally I traced it to the weirdest thing. When I screwed the treble control onto the bass the signal went away. When I loosened it it came back. But, now, on top of that issue, even when there is a signal the bass makes a farting sound if you play the B-String too hard. Really strange. I kind of feel like I should get a whole new set of electronics because something is obviously very wrong. Any ideas? Anyone ever have this happen?