Nonlinear Labs' first product - the C15 - is a polyphonic keyboard instrument based on digital sound synthesis. As the result of a puristic approach, the audio engine is not imitating analog machines of the past or using 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.