Description:

The Analog Real-Time Synthesizer, or aRts, is a modular system for
synthesizing sound and music on a digital computer. Using small
building blocks called modules, the user can easily build complex
audio processing tools. Modules typically provide functions such as
sound waveform generators, filters, audio effects, mixing, and
playback of digital audio in different file formats. The artsd sound
server mixes audio from several sources in real time, allowing
multiple sound applications to transparently share access to sound
hardware.