Hello, I have done 3 way wiring in my home with the GE smart switches and add-ons and have zero problems. I want to do a 4 way with 1 GE Z4001 and 2 GE add-on switchs and now I am confused by the wiring. Below is what my wiring looks like. One thing to note is all my switchs will be in gang boxes that have extra neutral wires. So this photo does not look like I have neutrals but I do.