e VST3 SDK.<br />
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 The <em>audioInputFrame</em> and <em>audioOutputFrame</em> arrays hold the frames for the audio input and output busses. The <em>auxAudioInputFrame</em> array holds audio data that is coming from a side-chain. We will use this information in some of our side-chain-able plugins in later chapters. The <em>auxAudioOutputFrame</em> is reserved for future use as plugin APIs begin to implement auxiliary data channels (none do it so far).<br />
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