Yeah...Part of my struggle with the GFS pickups was the weird 3-wire configuration and the lack of documentation for the pickup, but with the on-off-on spdt switch, with red soldered to top, white to middle, and black to bottom I get north coil in top position, full humbucker in middle, and south coil in bottom. It seems to work (at least for the neck and bridge - don't know why the middle isn't working as desired), but it doesn't really "do" much tonally (just makes it a little quieter to my ears). Having gone through it now, I'll probably pull the switches and do something different at some point in the future. It's cool to have all the extra "stuff" (lots of impressive-looking nobs and switches) and functionality but it's so subtle - I'm too much of a ham-fisted, rock-pounding clod to bother with it...and between the three pickup sounds and adjusting the tone, there's a lot of variation already. Might just be the nature of these pickups, too...be interested to test a different MM-style pickup with 4 conductors to see if it's just something specific to the GFS design.
It was cool to try, tho...and this helped me get over being intimidated by the wiring part. I'm scheming for my next build (I'm thinking tele bass on steroids, but what happened to the tele bass kit Pitbull used to sell?), and the whole process on the Gedenbacker has given me some cool ideas and better insight into what I want to do on the next one and how to achieve it.