DigiTech, an offshoot of John Johnson and David DiFrancesco's DOD Electronics, was one of the first companies to develop digital effects for guitarists, and initially made its reputation with the DSP128, the first multi-effects processor, revolutionary in its ability to use three effects at once. They followed this with the IPS33, the first successful intelligent harmonizer for musical instruments. It was with the introduction of the original Whammy Pedal in 1990, though, that they really broke through with an effect that's still sought after in the vintage market, as well as still in production in its fourth generation.
DigiTech followed with a succession of groundbreaking products—the RP-1 preamp/processor, the GSP2101 effects processor, the entire line of Vocalist processors for live harmonization of vocals, the JamMan loopers and many others. DigiTech’s addition to the Harman family of products only broadened their range by giving them access to new resources with strategic alliances to other Harman brands like Lexicon. Digitech continues to design and produce pedals and multi-effects units that have made them among the most innovative manufacturers of guitar products in the world.