Ok so I am going to have a bass built with usacustom parts. I wanted to put a p bass neck and a EBMM bridge pup. I see Nordstrand makes both pickups. Now I know nothing about the electronics and pickups. All I know is I do not want to have more then 4 knobs. Can someone please explain to me what I need to buy to make that work. So I can use either pickup or both at once. I don't even care if its active or passive. I will probably need stacked knobs to control all that. Can someone tell me what preamp or preamps I need to run that? Do I need 2 preamps one for each? And what kind should I get that will sound the best and most like a MM. And a pbass.