I scored a Sting bass pickup (single coil)off eBay, and stuck it in place of the neck pickup of my jazz bass (stack knob) with minimal modification. Whoa! Truly the best of both worlds!! I great P sound with just the neck pickup. Add the bridge pickup, and voila! Jazz bass!!! It's a little different than a pure J+J sound, but it's pretty darn close! Why hasn't this been done before, or has it? Surely someone else has tried this!