German music company created by namesake Dieter Doepfer. The company is best known for its A-100 series, a very extensive modular synthesizer line which includes some unusual modules such as the A-194 control voltage-to-MIDI converter, and the A-196 phase locked loop. All of the A-100 series modules are built in the Eurorack format. Other products include master keyboards, MIDI controllers, and analog sequencers.