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Change / ensure the following setting are correct:
Recording > Audio Recording
Source > Audio
Ensure Audio Settings are setup as follows (see screenshot):
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a. Input should be your routing software (explained more below)
b. Output should be your speakers
On the app, click “Load”, navigate to your plugins folder and select the Vividizer plugin.
Mac Global:
[Macintosh HD]/Library/Audio/Plug-Ins
The gain on the right side should be up 3/4 of the way to be at normal volume.
Another example is this AU host on Mac, which is free and simple:
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