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The Audio Unit - Apple Developer
https://developer.apple.com/library/archive/documentation/MusicAudio/Conceptual/AudioUnitProgrammingGuide/TheAudioUnit/TheAudioUnit.html
The audio unit you build in Tutorial: Building a Simple Effect Unit with a Generic View makes use of all three of these methods: GetParameterInfo, GetParameter, and SetParameter. An audio unit sometimes needs to invoke a value change for one of its parameters. It might do this in response to a change (invoked by a view or host) in another parameter.
Introduction - Apple Developer
https://developer.apple.com/library/archive/documentation/MusicAudio/Conceptual/AudioUnitProgrammingGuide/Introduction/Introduction.html
Making Further Progress in Audio Unit Development. To go forward in developing your own audio units based on what you learn here, you will need: The ability to develop plug-ins using the C++ programming language, because the audio unit class hierarchy in the Core Audio SDK uses C++. A grounding in audio DSP, including the requisite mathematics.
The Ultimate List of Audio Units - Retronyms
https://retronyms.com/audiounits/
The world of Audio Units is vast, and that can make things difficult when just beginning to experiment with Audio Units in your music. Further extend your musical possibilities with Audio Units, and check out this master list of all apps available.*
Making Audio Plugins Part 1: Introduction - Martin Finke's ...
http://www.martin-finke.de/blog/articles/audio-plugins-001-introduction/
Making Audio Plugins Part 1: Introduction. Making Audio Plugins. Welcome! In this tutorial series we will be learning how to create audio plugins that run as VST, VST3, AU, RTAS, AAX or as a standalone application. Audio plugins are programs that are loaded into a host software (such as Ableton Live, Logic or REAPER).
Full Audio Unit (AU) Compatible App List (657)
https://synthyfrog.com/technology-is-audiounit/
Audio Units (AU) is an audio plug-in technology built in Apple's macOS and iOS operating systems. Initially developed for desktop operating systems along with VST (Virtual Studio Technology by Steinberg GmbH), it available now for iOS too. AU apps (plug-ins) can modify sound pitch, sample rate and stream over network, produce signal.
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