Audio Toolbox

Media

Official docs outline

Essentials
Covers Porting your audio code to Apple silicon.
Audio Units
Covers Generating spatial audio from a multichannel audio stream, Audio Unit v3 Plug-Ins, Audio Components, Audio Unit v2 (C) API.
Playback and Recording
Covers Audio Queue Services, Audio Services, Music Player, Anchoring sound to a window or volume.
Audio Files and Formats
Covers Audio Format Services, Audio File Services, Extended Audio File Services, Audio File Stream Services.
Utilities
Covers Analyzing audio performance with Instruments, Audio Converter Services, Audio Session Support, Audio Toolbox Debugging.
Deprecated
Covers Deprecated Symbols.
Reference
Covers AudioToolbox Structures, AudioToolbox Enumerations, AudioToolbox Constants, AudioToolbox Functions.
Macros
Covers Macros.
Protocols
Covers SpatialAudioExperience.
Structures
Covers AutomaticSpatialAudio, BypassedSpatialAudio, FixedSpatialAudio, HeadTrackedSpatialAudio.
Variables
Covers kAUAudioMixParameter_RemixAmount, kAUAudioMixParameter_Style, kAUAudioMixProperty_EnableSpatialization, kAUAudioMixProperty_SpatialAudioMixMetadata.
Functions
Covers AudioConverterFillComplexBufferRealtimeSafe(_:_:_:_:_:_:), AudioConverterFillComplexBufferWithPacketDependencies(_:_:_:_:_:_:_:), AudioFileWritePacketsWithDependencies(_:_:_:_:_:_:_:_:), AudioServicesPlayAlertSound(_:spatialExperience:).

Each section links to the official page. Titles and summaries by Extra Credit; the docs belong to their authors.