Parallel cleanish to heavily distorted signals, both of which stand alone quite well but get even better together. High and Low control the gain of their respective signal paths along with frequency response. Turn High up, get more gain and more treble, dig?
Very interactive with your volume and tone knobs. For real. I never trust that when I read it but it's true here.
The five-knobber has fully adjustable blending (Balance) from all-High to all-Low and everything in between so you can have low gain High mixed 90/10 with highest-gain Low. Input is a pre-gain for precise tuning of just the sound you want.
Entirely discrete transistor/fet circuit. Top jacks, standard power, true bypass, etc.