Based on the awesome work at https://github.com/fulldecent/system-bus-radio https://github.com/fulldecent/system-bus-radio I use PDM to output a .wav file via

Based on the awesome work at https://github.com/fulldecent/system-bus-radio https://github.com/fulldecent/system-bus-radio I use PDM to output a .wav file via the system bus, and pick up via a radio.