A Vocalist You Can Play, an Instrument That Changes the Concept of Playing A vocalist that sings at the touch of a key . . . The CT-S1000V is an instrument that redefines the concept of a keyboard and how it’s played. At its core is Casio’s new Vocal Synthesis technology, which lets you go beyond conventional playing, opening up new creative possibilities and freedom of musical expression. Capture that moment of inspiration in real time, and enjoy a unique musical experience.