Hello. I'vea just finished installing Bartolini pickups: Bartolini P-Bass pickup and Bartolini MusicMan pickup, wired with Bartolini NTBT preamp (Volume Balance 2 band EQ). The notes on the E string sound distorted even when not digging in. The distortion appears on other strings too, but only when I dig in. Can it be a wiring problem? Actually, when digging in all strings distort (even when lowering the volume). How can it be avoided? Here is the soundclip: It's a rif played on the E string, then the same riff on the A string. First neck PU (pbass), then bridge (MM PU), then both together, with volume full on. After that the same thing, but with volume half on. Thanks!