On second glance, it has a transformer & the "HI" "LOW" Impedance switch, making the extra output jack more of a mystery. Somebody, either on this sight or Jules sight, posted an excellent sumary of what all four sets of leads do. The pickups can run on two leads each. They've eliminated the "Phase" switch. Don't know if one of the "Tones" is suppose to be a "Bass" control, as Witch Hat knobs never came in anything other than Volumn & Tone.