coil tapping

i was hearing something about coil tapping-in phase, out of phase-and i was just wondering what that was all about. also, can you use a stacked double coil? (what i have now is a full set of vintage noiseless on my strat, i'd like to keep them) does in or out of phase actually make a phaser noise? i'd really like to know all this. thanks

This is a vey good website that will answer most of your questions...www.guitarnuts.com

if it doesn't just come back and ask again, and in case you can't wait to find out, No, out-a -phase, etc.. won't give you that phase shifter sound...........