From around 1980, some arcade games began taking steps toward digitized, or sampled, sounds. Namco's 1980 arcade game "Rally-X" was the first known game to use a digital-to-analog converter (DAC) to produce sampled tones instead of a tone generator. That same year, the first known video game to feature speech synthesis was also released: Sunsoft's shoot 'em up game "Stratovox". Around the same time, the introduction of frequency modulation synthesis (FM synthesis), first commercially released by Yamaha for their digital synthesizers and FM sound chips, allowed the tones to be manipulated to have different sound characteristics, where before the tone generated by the chip was limited to the design of the chip itself. Konami's 1983 arcade game "Gyruss" used five synthesis sound chips along with a DAC, which were somewhat used to create an electronic version of J. S. Bach's "Toccata and Fugue in D minor".