I'll try to find a wiring diagram for a Gibson SG Exclusive. It had a pot (stacked dual-section?) that acted as a blender control for the hum coils only. I *think* twisting the knob toward smaller numbers increased resistance and at 0 the humbuckers were 100% split. The Dirty Fingers humbuckers were filthy, with little definition, but with the knob on 5 or 6 mine would get get clean and spanky like a mini-humbucker.