The Diezel Zerrer is a 2 channel preamp in a pedal that can be utilized in front of an amp as a distortion, as a practice amp, and a studio direct amp with aggressive tones and features that are synonymous with Diezel. There is a stereo headphone jack which allows the use of the Zerrer as a practice amp. In addition a stereo aux input providing the ability to plug in external backing tracks. The versatility of the Zerrer is second to none like having a Diezel head in a box that can be taken on the road for practicing, recording and playing live in front of any clean amp.