DOD originally stood for David Oreste Di Francesco, who founded the company in 1974. He was the original engineer who later sold the company to Harman International. The engineer now runs a company called Rolls Corporation.
DOD now stands for "Division of Digitech". Many of the more popular DOD pedals are now available under the Digitech name. This includes the Grunge, Death Metal and Envelope Filter.
DOD created a cheaper range of effect pedals that was sometimes said to be designed for the more novice musician, although they are still used by a number of professionals. For example many DOD distortions are largely designed to be played in a bedroom at quiet volumes through a small amplifier and some musicians playing them at high volume with a band find the sounds to be uncontrollable.
Many of the pedals are very highly regarded by experimental and noise music artists for their unique, extreme sounds and lo fi settings which are sometimes not attainable on more expensive musical equipment. Some pedals, such as the Buzz Box or Gonkulator Modulator, have become collectors items and change hands on ebay for far more than they cost new. The most popular DOD pedal was probably the "Grunge" - an extremely heavy distortion pedal designed to emulate the sounds of Nirvana and The Melvins. DOD boasted that it was used by Kurt Cobain. It was given to him as a joke and he was said to have hated the pedal to the point of throwing it into the crowd at one concert.