It mentions on the STL-2 page that the pickup can be coil tapped. However, I was previously under the impression that only humbuckers could be coil tapped. How does this work with a single coil pickup? It mentions that the output is lowered while tapped, but I don't understand how this works considering that the output is determined by the number of coil windings, and a swtich can't simply unwind the pickup.