Okay, next year I'm going to build a custom bass using a Modulus J type replacement neck and a warmoth body. The pickups I'm going to use are DiMarzio Model J's. I've seen on some basses (specifically G&L's and if I'm not mistaken the new Fenders with the S-1 Switching System) have a switch that changes the pickup from running in series to running parallel. What is the overall tone difference between the two? Is it worth the time to add in the switch? Or is it more or less going to be just a couple bucks extra for something I won't use....??????