Phase switch, one thing I am not sure with your guitar, isit wired to which pickups? I only have 2 HB not the single coil in the middle so I am not sure.
for example, are the HBs are wired to go out of phase with the single coil or with each other, like neck HB -single coil and sc - bridge HB.
For some reason I dont think you get all three in the bargain of in and out of phase wiring but i don't know why.
I am too lazy to upload an example of my own, but if ya look here I think ya can hear the difference right about the 1:10 mark he plays in phase then out of phase, you see him throw the phase switch.http://youtu.be/bm8UPEUqXE0
and here about 4:30http://youtu.be/zhX0MuGOUB8