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Dominic Milano (1980s). "Wendy's Moog Synthesizer in 1979". Wendy Carlos. — list & photograph of Wendy's modular, including Moog spectrum encoder/decoder for vocoder
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"Das Siemens-Studio für elektronische Musik von Alexander Schaaf und Helmut Klein" (in German). Deutsches Museum. Archived from the original on 2013-09-30.
^"EMS Vocoder Demonstration Tape". EMS Vocoder 5000. Electronic Music Studios (London), Ltd. October 14, 1976. Archived from the original on March 17, 2012. Retrieved March 22, 2012.
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"KROK". Museum of Soviet Synthesizer. — The only Russian rackmount Vocoder, Крок Вокодер