I'm wondering what's the electronic to achieve the double direction of the new Dingwall Super P passive tone? For those who don't know what I'm talking about : simply put, the tone is 100% at middle course of the pot. Roll off the pot, it acts like a regular tone control, cutting the highs. But turn more than the center point, it'll cut in the mid range (I suppose around 800 hz?). Brilliant! I understand I can do that with a balance pot (2 pots together) with a center detent. one side will be the usuall capacitor to roll off the highs, but the other side ?? Is it only a cap? Or is there some inductance as well? Serie or parallel? Is it a resistor in series with the cap? What value? Any help greatly appreciated!