 The capacitor serves to limit the low end response of the neck pickup, and also phase delays the signal from that pickup, resulting in a fuller tone, not too unlike the #2 and #4 switch positions on a Fender Stratocaster guitar.Note that these switching options are for the original 1970s L6-S with sealed ceramic Bill Lawrence Humbuckers and are somewhat different for the 2011- reissue L6S, which use 490R/498T split coil pickup switching and different wiring.Some 2,000 L6-S Midnight Special instruments were produced, with maple body, and bolt-on 3 piece maple neck with a maple fingerboard and a maple face on the head-stock, these Colors were available; Natural Maple, Wine Red & Ebony.