I have recently purchased a used Fernandes FGI active preamp, does anybody know how to wire it? It has a volume pot and a balance/blend. I want to take those off and put my stock pots on it - master vol, balance, mid, bass. I can probably figure the ones that are hooked up but where do the green, orange, yellow wires go? Also the jack was disconnected, I know the brown and black from battery go to it but what else? Does it matter which wires are hooked up where on the jack? I need to know a lot on the preamp but it's a pain since it came on a bass, not sold as a single unit, thus no schematic exists. If anyone has a Fernandes bass and wouldn't mind cracking it open and checking it out for me I would appreciate it very much.