Feedboxes are interactive sound objects that generate rhythmic and harmonic patterns. Their purpose is to create intuitive tools for live improvisation, without the need for using computer with midi controller or fixed playback. Their only means of communication is sound — they "listen" with the microphone and "speak" with the speaker, thus interaction with Feedboxes is very similar to playing with real musicians. The boxes could be used together with any instrument, or on their own – in this case they create a feedback loop by listening and responding to each other, creating ever-changing rhythmic structures. Feedboxes react to incoming sounds in simple, predefined manner. Yet, when used together, their behaviour may become quite complex. Each of two boxes has its own sound and set of simple rules.