How to add a reverse phase switch using a push pull pot.
This is a really easy mod to do yourself and gives a unique, hollow sounding tone when the pickups are out of phase.
It was a very common mod during the 70s and 80s and players such as Brian May and Jimmy Page put it to good use.
Peter Green is well known for his out of phase tones. However, this was actually achieved by manually flipping the magnet in his neck pickup. This is the "electronic" way of doing it, rather than the pickup magnet flip.
Out of phase, simply put, means that the polarity of one of the pickups is flipped.
Les Paul Wiring Diagrams: