Several useful diagrams with 4-way wiring diagrams like Wiring Diagrams for GE Smart Switches, but unfortunately - like several other circuits in our home - one switch has no dedicated neutral. All that’s coming in is a single romex with your standard black/white/red/ground.
The line comes into a 3-way switch (it also powers several other switches for different loads) that goes down to a 4 way with the blacks pigtailed and the reds and whites into the switch, then one romex goes out to another 3-way switch so that last switch has no dedicated neutral.
Can this be made to work with the GE add-ons? It seems the whites aren’t the neutrals on the 4-way, so I guess the blacks are? The red was at least the traveler between the powered 3-way switch. So would I pigtail the whites, and jump the reds and blacks to the add-on (I’d put some white electrical tape on the black wires as well).
The various diagrams have been helpful in understanding what the wiring should look like if our house wasn’t wired by some cheapskate (I’ve had to repair a lot of half-arsed things), but this house doesn’t fit any of those diagrams.