I'd love to have that clarified. My understanding (at least with the Paul's Guitar) is that the controls split the humbucker and then add the capacitor to the signal in order to "fatten" the sound to make it more pleasing. From the image in my article, that's how it appears to be wired. I would be surprised if anything was being sent to ground because they specifically state that the mini-toggles allow them to "isolate" a single coil of the humbucker, rather than sending a coil to ground. You can find some info about that on PRS's website here:
https://support.prsguitars.com/hc/e...nces-in-TAP-SPLIT-and-ISOLATED-SPLIT-Pickups-. I'm not sure how different that sounds to a traditional split, but I'll be testing it in the future. It does state on that page that the McCarty's use a
tap, which I didn't catch before. Perhaps on that model they're using something like 1 and a half of the coils by tapping one of them. But it's also possible they're just mislabeled. On the marketing video, it says "coil split" and not tap. Also on the 58/15 they're selling now, there's no wire for a tap.