I have a fender jazz with the s1 switch. If I'm not mistaken, that's suppossed to put both pups in either series or parallel correct? So would it be safe to say that if either pup is in the off position, the switch is rendered useless? Also, if the switch is depressed is it series or parallel? And lastly, what is the best way to get a p-bass sound out of a jazz? 

