I'm aware of the S-1 switch on a Jazz bass and of the aftermarket Position 4 on a Telecaster guitar, and know what changes when their two single coil pickups are put in series. But I haven't managed to find much info about how a PJ sounds when wired in series. I'm contemplating adding that option to my Yamaha BB424, as I seem to have gone off the tonal hallmarks of two pickups combined in parallel. I'm hoping it just gently fills in the slight hollowness in the middle of the tone, but I'm wondering if would just make a nasty, constricted, overly thick parp? So, please tell me, if you know A link to a worthwhile demo would make me very grateful.