Initially inspired by the rare Harmonic Percolator, it offers expanded features in order to increase the gain, output, and brightness with two silicon transistors along with a pair of silicon diodes configured for asymmetrical clipping. The Density control goes from a thick fuzz tone that can sound like an amp ready to explode all the way to a tight harmonically rich overdrive that screams Rock & Roll. The Diodes control allows you to set the threshold of the diode clipping circuit, from full clipping to get the most distortion and compression all the way to no diode clipping for a wide-open (and LOUD!) sound. The Input knob controls how much of your guitar signal gets to the harmonic generator. Set it low for a lively boost, laden with even-order harmonic content. Or crank it all the way up to get fuzz blasts!