The Poison Ivy fuzz pedal is modelled on a Univox Super Fuzz, with an ultra-twist. Such as the style used by Pete Townsend on the Live at Leeds album and used by The Cramps. There is a 2 position tone switch which gives you 2 different sounds and the expander knob takes the fuzz sound from a wide fuzz sound to completely over the top providing some great octave sounds. The internal trim pot also allows you to fine adjust the internal octave amp. If you would like to have the halo light plate fitted at an additional cost then please request this prior to ordering.