The Jordan Boss Tone. I believe they had to change it to "Buzz Tone" for legal reasons but it's the same great circuit. Very bright fuzz, great cleanup, great with humbuckers, with that characteristic hint of sub octave in the lower gain settings. If attack is zeroed or maxed it tends to self-oscillate. There's a diode-lift switch on the side that turns it into kinda more of a treble boost but I don't mess with it too much.