5-Way Switch, Volume and Tone
The problem with mixing humbucker and single coil pickups is that humbuckers work best with 500K pots, but single coils sound better with 250K. A single coil wired with 500K pots will sound overly bright, and a humbucker with 250K will have too much treble rolled off.
Adding a 470K resistor to the single coil compensates for this by reducing the value of the pot to make the single coil sound like it should.
