Have a Squier strat that came SSS with a volume and 2 tone knobs and the 5 position switch. I put a 59' in the bridge. All I did when swapping out was unsolder the old bridge and solder in the new bridge. The 59' works great. I'm puzzled now because one of the tone knobs acts as the volume for the two single coils and the switch only works in the 1, 3, and 5 positions. I understand that 1 is the 59' only, 3 should be the middle coil, and 5 should be the neck. My questions are: 1) Why doesn't 4 work as the neck and middle? and 2) How did one of the tone pots become a volume for only the single coils?