I am trying to change the preamp in my Warwick Streamer standard, so I bought a Bartolini pre because it looked pretty easy to install. So I go to install it and relize there is four cables coming from the stock passive pickups. They are all bundled in one but there is a red, black, green and white. so the bartolini diagram shows connect the wire from the pickups to the pot as follows http://www.bartolini.net/instructions/electronics/ntmb/ntmb918f.htm which one do I connect? and why is there four, do I just let them stay unconnected. Please any help or advice would be greatly appreciated.