aRts is a framework for developing modular multimedia applications. The sound server, artsd, allows multiple applications to cooperatively process and output sound and music. aRts is designed to provide its filter and synthesis capabilities to other applications using the multimedia communication protocol (MCOP). aRts is also capable of modular realtime synthesis. It can create sounds & music (realtime midi synthesis) using small modules like oscillators for creating waveforms, various filters, mixers, faders, etc.