When the alter switch is in neck position, two hum tap mode is on. When the alter switch is in bridge position, two hum tap mode is off. Two hum tap mode means the neck and middle pickups are wired in series and functioning as a humbucker. When two hum tap mode is off and the pickup selector switch is in neck position, neck pickup is selected. When the switch is in between neck and center position, neck and center pickups are selected. When the switch is in center position, center position is selected. When the switch is in between center and bridge position, center pickup and neck side of the bridge pickup are selected. When the switch is in bridge position, the bridge pickup is selected. When two hum tap mode is on and the pickup selector switch is in neck position, the neck and center pickups are selected and they are in series. When the switch is in between neck and center position the neck pickup and bridge side of the bridge pickup are selected. When the switch is in center position, neck, center, and bridge pickups are selected; the neck and center pickups are in series mode. When the switch is in between center and bridge position, the neck side of the bridge pickup is selected. When the switch is in bridge position, the bridge pickup is selected.