Very cool, yet simple concept.My patented circuit that sounded surprisingly good for a simple diode clipper was to add a pair of anti-parallel diodes across just the boost leg of the bass section of a Baxandal tone control. The diodes were out of the circuit for most normal signal levels, but if/when the operator was commanding a lot of bass boost "and" there was significant bass signal present, the diodes would clamp just that bass part of the signal at +/- a diode drop. Since this bass leg of the Baxandal tone control is naturally LPF by the circuit the HF distortion from diode clipping is reduced and then masked by the normal HF audio signal being passed cleanly by the treble side. Since the fixed instal products were combination mixer-amps the gain structure was fixed and I could index the bass diode clamping to specific output power levels.
While I would not call this a hifi circuit it was surprisingly good sounding and very effective, for that application all for the cost of a couple diodes.
I can believe that it sounded good too.