EXAMPLE 4: Apple AUMatrixReverb with a MONO Audio Cue.
AUMatrixReverb worked well in our previous example so our next example uses it again with a MONO (single channel) audio cue:
AUMatrixReverb is clearly incompatible with Mono audio files. In this case, this manifests itself as a pass-through of the original audio. Other incompatible plug-ins may not pass any audio at all.
If you are restricted to the standard AU plug-ins it is simple just to convert the mono file to stereo, in an audio editor.