Nonlinear Labs is the maker of the C15 - a polyphonic keyboard instrument based on digital sound synthesis. As the result of a puristic approach, the C15 does not imitate analog machines of the past, and it does not make use of samples or other complex data. Instead, it is based on elementary mathematic algorithms combined with feedback loops. It opens new fields to be explored by sound designers and gives performing musicians a playability and dynamic response similar to an acoustic instrument. The C15 is built for those who love to play keys.