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"The Yamaha DX7 is a FM Digital Synthesizer manufactured by the Yamaha Corporation from 1983 to 1986. It was the first commercially successful digital synthesizer."
The Yamaha DX7 earned a reputation of being difficult to program, but this is mostly because most people who attempt to program it were accustomed to the more traditional synthesizers. Instead of using wavetable synthesis, the DX7 was built upon entirely different sound engine design, "consisting of a combination of "carrier" sine wave oscillators and "modulator" oscillators that can be interconnected in numerous ways, and being organized into 32 most useful 'algorithms'". Because of this, the DX7 was more capable than other devices in its price range, and understandably more complicated to program. "Those who made effort to become proficient in programming the DX7 however, were rewarded with the full range of the instrument's expansive soundscape." (http://en.wikipedia.org/wiki/Yamaha_DX7)