Has anyone here been happy with a preamp used to replace the stock Jazz24 unit? The one I have is pretty awful, and it seemed to get worse. When I first acquired the bass, I don't remember it being so muddy, but now I can't seem to get useful tones out of it. The stock pickups are some type of Seymour Duncan passive unit, and I assume they're worth keeping. But the preamp in these things was known to be failure prone, so it may be worth replacing I guess. I was looking at a Bartolini NTMB using the "4 knob, 1 Switch" configuration, or maybe an Audere Classic module? (Not sure whether the "pro-Z" switch is worth it.) Not sure whether it will be worth it regardless, frankly. I already dumped money into the neck (had it PLEK'd) because the frets weren't very good out of the factory, but I haven't been playing it much because I've also been unhappy with the electronics. Now I'm looking at dumping more $$ into the electronics, with no guarantee I will be happy with the result. Such is the modification risk, I suppose.