Mixing : Basic Mixing : Auxiliary Input Tracks and Signal Flow : Common Uses for Auxiliary Inputs

Common Uses for Auxiliary Inputs
Auxiliary Inputs can be used to:
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Apply real-time plug-ins or an external processor to a submix, using the Auxiliary Input as an effects return (such as reverb or bus line compression)
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Input audio from external MIDI instruments and other audio sources into the mix, to monitor or route to audio tracks for recording to disk (such as from the audio outputs of a MIDI synthesizer)
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Mix multiple outputs from an instrument plug-in (such as Structure, Strike, or Transfuser)