Anyone done a J J J bass starting with a regular J bass and then adding a third J pup in the "mudbucker" position? I am adding a mudbucker to my P bass and am thinking about adding a third J pup to my jazz. The main question I have is about hum cancellation. If I stick with single coils, do I want to use a bridge pup in the far neck position (so that it would hum cancel in the normal way when I run the middle and far neck together)? I did not measure yet, but am guessing the pole spacing would be closer if I used a J neck pup. If I did that do I just have to reverse the polarity of the leads to make it hum cancel with the middle? Thanks.