-CB- said:The ES-345/ES-355 uses two output jacks. One for mono, one for stereo. The mono jack is a switched one that closes the two pickup circuits together on plug insertion.
Some guitars - actually had split pickups, and wired the bass strings to one jack, and treble to another. You can do this with Fender "Humbucking" (the big ones). Also Fralins P92 works with dual coils in that manner. Its also possible with the Pbass pickup.