The improved DSi is thinner than the current DS model, and will have a bigger screen, he said. The machine also comes with an audio player, to play sound stored in a memory card. Users will be able to change the speed of the sound. In a demonstration, Iwata showed that players will be able to listen to a foreign language lesson at a slower speed, or distort music or voices to a shrill pitch for fun. Nintendo also demonstrated new game software for its hit Wii home console, including “Wii Music.” Players just need to jiggle their remote controller to feel as though they are playing any of 60 musical instruments, including a drum set, sitar, saxophone and piano, although there are only 50 preprogrammed melodies. Nintendo has sold 77.5 million Nintendo DS handheld devices worldwide, nearly 23 million in Japan, far outselling Sony Corp.’s rival offering, the PlayStation Portable, at 41 million globally — 10 million in Japan.