The Convulsion CN-1 from Audible Disease is a nasty high-gain overdrive unit with a few extra features that push your sound into the realm of absolute madness. With a twist of the NOISE knob, you can blend pure white noise with your input signal for extra psychotic enjoyment. If that isn't enough craziness for you, this beast also has the ability to decimate the sound even further with the SPIT knob. By tweaking this knob, you'll hear why this pedal is called the Convulsion! You'll hear your sound start to cough, spit and sputter on the verge of auditory death. R.I.P. Special artwork by the esteemed Bay Area artist Bonnie Banks. Operates with either a 9 volt battery (included) or a standard 9 volt negative tip barrel type adapter (not included).