Casio is a large-scale electronics manufacturer based out of Japan that produces cell phones, cameras, watches, but most importantly, instruments. The Casio VL-1, often known as the VL-Tone, was the first instrument designed and released by Casio in 1980, and included a synth, sequencer and, bizarrely, a calculator. Since then, Casio has designed numerous electronic instruments and musical accessories, but most notable are their keyboards. Great for beginners or musicians on a budget, Casio keyboards are fairly ubiquitous in the current keyboard market.
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