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ALSA
ALSA, also known as Advanced Linux Sound Architecture, is the default sound subsystem for most GNU/Linux distros, used most often in combination with pulseaudio. ALSA replaces OSS and a myraid of other convoluted solutions to Audio on Linux, and has remained somewhat stable for the last few years. Due to some drawbacks in the design and implementation of ALSA, pulseaudio is also used on many distros as a layer between software and ALSA to ensure that multiple applications can play sound simultaneously, something ALSA may stumble with natively.