The Advanced Linux Sound Architecture (ALSA) provides audio and MIDI functionality to the Linux operating system. ALSA is released under the GPL (GNU General Public license) and the LGPL (GNU Lesser General Public License). ALSA has the following significant features:

• Efficient support for all types of audio interfaces, from consumer soundcards to professional multichannel audio interfaces.
• Fully modularized sound drivers.
• SMP and thread-safe design.
• User space library (alsa-lib) to simplify application programming and provide higher level functionality.

Support for the older OSS (Open Source Software) API, providing binary compatibility for most OSS programs.

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