I'm planning on bullding my own guitar soonish, and I'm looking into pick ups and wiring at the minute, I know what four wire pick ups do (basically you can turn two sing coil pick ups into a humbucker at the flick of a swith), you get these options:
1)inseries/ out of phase
2)in parralel/ in phase
3)In series/ in phase
4)In parralel/ out of phase
5)Either coil alone (split)

but there was a guitar that had this kind of set up, and you could switch between either coil alone or only two of the other four (i think it was the in phase ones)...
I was wondering could you set your guitar up so you could chose between all five?
Is that nasal sound you get out of some guitar due to the pick ups being out of phase (as i'm not really sure what out of phase pickups mean sound wise)?