Drone Master Distortion

The Drone Master takes the op-amp ProCo Rat circuit and mutates it well past the original for heavier use. Level, Filter and Gain match the familiar Rat layout, with the Filter rolling off highs as you turn it up, and two toggles expand the range: one switches the midrange between a scooped and a boosted voicing, the other between LED and silicon clipping for a softer or harder edge. That covers tight modern distortion, classic Rat grind, and thick, saturated doom tones depending on the settings. It runs on 9V center-negative, draws 40mA, and uses true-bypass soft switching.