Appendix: Audio Unit Class Hierarchy

This appendix describes the Core Audio SDK audio unit class hierarchy, including starting points for common types of audio units.

Core Audio SDK Audio Unit Class Hierarchy

The following figure illustrates the main classes and class relationships in the Core Audio SDK audio unit class hierarchy, for Core Audio SDK v1.4.3.

Starting Points for Common Audio Units

• For general, n-to-m channel effect units, start with the AUBase class

• For n-to-n channel effect units, which map each input channel to a corresponding output channel, start with the AUEffectBase class

• For monotimbral instrument units (either monophonic or polyphonic), start with the AUMonotimbralInstrumentBase class

• For multitimbral instrument units, start with the AUMultitimbralInstrumentBase class

• For format converter or generator audio units, start with the AUBase class

• For music effect units, start with the AUMIDIEffectBase class

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