The Wampler Sovereign Distortion is a versatile beast of a distortion
pedal that is unlike the rest of its ilk. The gain is rich and full of
harmonic overtones, never sounding or feeling fake and stiff.
Surprisingly shapeable and responsive, the non-traditional gain and EQ
controls allow you to tune the pedal to suit any setup, and instead of
just emphasizing a certain frequency range, they actually change the
texture of the gain. With the right settings dialed up, it can nail the
elusive sludgy deep sound loved by stoner metal guitarists, along with
virtually every other shade of high-gain tone a player can imagine.
You can find original thread and schematic on FSB forum here.
