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PulseAudio

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PulseAudio is a sound system for POSIX OSes, meaning that it is a proxy for your sound applications. It allows you to do advanced operations on your sound data as it passes between your application and your hardware. Things like transferring the audio to a different machine, changing the sample format or channel count and mixing several sounds into one are easily achieved using a sound server. It is most often found on GNU/Linux distros and is a Freedesktop.org project, much like systemd and avahi.

PulseAudio is designed to solve some of the issues that ALSA suffers from, and like most Linux audio solutions, comes with quite a few of its own.