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Specify the Function of Your Audio Unit

With tools in place, you begin your development of an effect unit by describing its digital signal processing. In this case, you specify an audio unit that provides monaural tremolo at a user selectable rate. You’ll implement the DSP later, but establishing a bird’s eye view up front lets you narrow down the implementation steps.

Next, pick an audio unit type based on the function the audio unit will perform. Look through the various types of standard audio units in the AUComponent.h file in the Audio Unit framework. Also, refer to the descriptions of types in Audio Unit Specification. The kAudioUnitType_Effect, with four-character code of 'aufx', looks appropriate for this purpose.

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