Wikipedia about Audio Units

Audio Units

From Wikipedia, the free encyclopedia

Audio Units (AU) are a system-level plug-in architecture provided by Core Audio in Mac OS X developed by Apple Computer. Audio Units are a set of application programming interface services provided by the operating system to generate, process, receive, or otherwise manipulate streams of audio in near-real-time with minimal latency. It may be thought of as Apple’s architectural equivalent to the other popular plug-in format, Steinberg‘s VST. Because of the many similarities between Audio Units and VST several commercial and free wrapping technologies are available (e.g.Symbiosis and FXpansion VST-AU Adapter).


Mac OS X comes with Audio Units allowing one to timestretch an audio file, convert its sample rate and stream audio over a Local Area Network. It also comes with a collection of AU plug-ins such as EQ filters, dynamic processors, delay, reverb, and a Soundbank Synthesizer Instrument.

AU are used by Apple applications such as GarageBandSoundtrack ProLogic ExpressLogic ProFinal Cut ProMainStage and most 3rd party audio software developed for Mac OS X such as ArdourAbleton LiveREAPER and Digital Performer.

Competing technologies

External links


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