This How-To is quite wordy, because this concept is a little complicated. However, by going step by step, the complexity should unravel somewhat.
The trouble with reverb on Mic cues, in general, is that most reverb plug-ins only work with a specific number of inputs (generally one or two), and that is seldom the number of input channels available in a Mic cue.
The reason for this is that the number of inputs on a Mic cue is equal to the number of input channels on the audio device you’re using. If your audio device has, say, four microphone inputs and four line level inputs, then each Mic cue will have eight possible inputs, and thus eight rows in the matrix mixer.
So, to use reverb on a Mic cue when using that device, you either need a reverb plug-in that supports eight channels of input, or you’ll need to put the reverb on an output or a pair of outputs. You can put AudioUnits on either cue outputs or device outputs; we recommend cue outputs in this case, and you’ll see why later on.
For this How-To, let’s suppose you’re using an audio interface with a microphone plugged into input #1. Let’s also suppose that you’re using only two speakers, plugged into the interface’s output #1 (left speaker) and output #2 (right speaker.)
We’re going to use Apple’s AUMatrixReverb which requires two channels of input.
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