I bought an Audere Pro Z preamp on a whimto have an interesting project. Gutted my six string, but I'm having issues getting it working - I followed the instructions exactly - but there is simply zero sound coming out. The LED will light up blue when I place my input jack in. I shielded the bass with conductive adhesive copper tape and taped in a guitar string linking the pickup cavities to the control cavity. I have the cavity going to the output ground and the brisge ground doing the same. I soldered the pickup hots to the individual wires mentioned, and soldered the pickup grounds together, and then to green/white, as instructed. Yet: no sound. Is it simply my bad soldering? Am I missing something stupid?