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Pull switch on a passive Lull?

Well, the mystery is now solved. The person who modified it very helpfully drew a circuit diagram and taped it to the inside of the pickguard. The switch is on the blend knob and works as follows: in the down position, it goes from 100% neck pickup (clockwise) to 50/50 (counterclockwise), in the up position, it goes from 100% bridge pickup (clockwise) to 50/50 (counterclockwise). Strange ... not sure what the advantage is ... but it does work.