well, guys, this is what makes talkbass such an outstanding community and a place to acquire knowledge

as a PJ owner, I've been extremely happy with the first answer already, by line6man, which we can call basic and perfect anyway, but even more could be said -- and learned...
also from line6man himself

I mean, that thought about the pickups by his friend, Curtis Novak (in post #13 /
Jun 7, 2009 #13) is essential...!!!!
so beautiful!
thanks very much to all of you, it was totally enlightening to read this thread... some 12 years after the OP
- - -
PS:
I may have read this before, too... cause several years ago I replaced the PJ P for a normal P...
and desoldered the J pickup's wires...
I just forgot all the concept behind what I had done

and now I was thinking about taking out the J pickup for good... or perhaps installing a switch...