A π-box is a modular system of radio/streaming broadcast, composed of multiples inputs and outputs. The π-box aims to provide a multi-functional and easy-to-use micro-FM & streaming micro radio station. It is based on the mini-fm approach, developed in the 80's by the Japanese artist and researcher Tetsuo Kogawa, which promotes radiotransmissions of FM waves upon a tiny perimeter, such as a house, a block, or a small zone. The π-box combines this ultra local transmission with internet possibilities (through ethernet, WiFi or 3G/4G), to leverage all the possibilities of hybrid transmissions. The system is open source, and based on open source software / open hardware.