I've heard great things about the series mod for the Jazz basses. I've also heard that people have done this to PJ's with positive results. So I said, "what the heck" and bought a push/pull pot from guitarpartsresource.com and I installed it last night. For $10 worth of hardware and 1 hour worth of soldering, I am more than pleased with the results For those who don't already know what I am talking about. "Series" is the J bridge pickup feeding in series through the P neck pickup so that both pickups effectively act as a single pickup. My take on the sound is this. The overall "character" of the bass is unchanged. The instrument doesn't sound like a different bass or anything. But the sound is a bit "tighter" and "punchier" a bit more "harmonically complex" if you will. The bass response is enhanced and I can play the instrument with the tone control totally open without it sounding "scratchy". I'd describe the sound is very close to that of the P-pup soloed but with the P pup soloed, I have to roll off the highs a tad to get that "punch" and hence it gets to sounding a wee bit muddy. When I pull the knob (go to series mode), none of this is necessary. I still like the original mode for slapping, because I can dial in more bridge but for most other classic "P bass" type tones, I'm going to be using it in series mode, for sure. Anyone else done this on a PJ? What are your experiences?