Inter-App Audio (IAA) is a deprecated technology developed by Apple Inc. which routes audio and MIDI signals between applications on the iOS mobile operating system. The technology was introduced in 2013 in iOS 7 and deprecated in 2019 with the release of iOS 13.
Scope Inter-App Audio is a host-plugin technology. An IAA host application connects to a node application to send and receive audio, MIDI, timeline information, and other signals.
Node applications Node applications can be of the following types: Instruments (can receive MIDI signals and produce audio signals) Generators (can produce audio signals) Effects (can receive, transform and send back audio signals)
Limitations At the moment, audio signal routing is only possible with a sampling rate of 44.1 kHz.
Deprecation Inter-App Audio was deprecated in 2019 with the release of iOS 13 in favor of the third version of Audio Units.
Competing technologies Audiobus Audio Units Ableton Link
References
External links IAA Host Application List IAA Instrument Application List IAA Effect Application List Apple WWDC 2013: What's New in Core Audio for iOS