Doepfer Musikelektronik GmbH is a manufacturer of audio hardware based in Gräfeling, Germany, founded by Dieter Doepfer.The product range covers analog modular systems, MIDI controller, MIDI hardware sequencers, MIDI-to-CV/Gate/Sync Interfaces, MIDI master keyboards and special MIDI equipment. 

Dieter Doepfer began developing audio hardware with a Voltage Controlled Phaser (VCP) module for the Formant, a do-it-yourself-kit analog synthesizer from Elektor magazine in 1977. Several legendary modular synths followed while Doepfer also focused on the development of MIDI equipment during the 1980s