As home consoles moved into the fourth generation, or 16-bit era, the hybrid approach (sampled and tone) to music composing continued to be used. The Sega Genesis offered advanced graphics over the NES and improved sound synthesis features (also using a Yamaha chip, the YM2612), but largely held the same approach to sound design. Ten channels in total for tone generation with one for PCM samples were available in stereo instead of the NES's five channels in mono, one for PCM. As before, it was often used for percussion samples. The Genesis did not support 16-bit sampled sounds. Despite the additional tone channels, writing music still posed a challenge to traditional composers and it forced much more imaginative use of the FM synthesizer to create an enjoyable listening experience. The composer Yuzo Koshiro utilized the Genesis hardware effectively to produce "progressive, catchy, techno-style compositions far more advanced than what players were used to" for games such as "The Revenge of Shinobi" (1989) and the "Streets of Rage" series, setting a "new high watermark for what music in games could sound like." The soundtrack for "Streets of Rage 2" (1992) in particular is considered "revolutionary" and "ahead of its time" for its blend of house music with "dirty" electro basslines and "trancey electronic textures" that "would feel as comfortable in a nightclub as a video game." Another important FM synth composer was the late Ryu Umemoto, who composed music for many visual novels and shoot 'em ups during the 1990s.