Casio CT-X800C2 Musical KeyboardAiX Sound Source delivers High Quality Tones and Rich Expressiveness The CT X Series comes with the AiX Sound Source, which can produce a wide range of sound qualities from powerful bass tones to clear high tones. The exceptional computing power of the high performance LSI reproduces the natural charm of acoustic instrument sounds, such as the agreeable change in tone when a piano key is struck, the sensation of a drum performance, or soaring strings.