Founded in 1973 by David Oreste DiFrancesco and John Johnson, DOD Electronics was later purchased by Harman, the parent company of DigiTech. DOD effects are popular within the experimental/noise music community, and are prized for their unique sounds. In 2013, the DOD brand was revived with a number of re-releases of classic effects.

The FX35 Swell Pedal is a unique concept in effects pedals; it was designed to emulate backwards guitar sounds. It features attack, decay, cut and boost controls. The FX35 did not sell well and was discontinued in 1986 after only two years of production.