The group expressed particular interest in modular synthesizers, including the Moog synthesizer. Sequential Circuits Prophet-5 synthesizer, Fender Rhodes electric piano, and a vocoder for his voice. It combined a calculator, a monophonic synthesizer, and sequencer. The track features instrumentation from snare drums, harp, bass synthesizer and electric guitar. Devices such as the theremin, synthesizer and computer can produce electronic sounds. The Jupiter-8 is an 8-voice polyphonic analog synthesizer. It was recorded entirely with a Korg monophonic synthesizer. Dolenz purchased the third modular Moog synthesizer sold commercially. Metheny was one of the first jazz guitarists to use the Roland GR-300 Guitar Synthesizer. The instrument read punched paper tape that controlled an analog synthesizer containing 750 vacuum tubes. He currently uses a Korg M1 synthesizer. Early video game music was once limited to simple melodies of early sound synthesizer technology. The bass line is performed on a Yamaha DX7 synthesizer. In 1970, Moog launched a cheaper, smaller synthesizer, the Minimoog. The most common features a man dressed as Bach standing before a Moog synthesizer.