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In page Music sequencer:

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Yamaha's GS-1, their first FM digital synthesizer, was released in 1980.[1] To program the synthesizer, Yamaha built a custom computer workstation designed to be used as a sequencer for the GS-1. It was only available at Yamaha's headquarters in Japan (Hamamatsu) and the United States (Buena Park, California).[citation needed]