This could be a starting point, if I understand your requirement correctly.
You can add a
Scale modifier of -1.0 and
Offset modifier of 1.0. Then the
Color Monochrome module will output monochrome at zero volume, and saturation will increase with volume.
Use a more negative
Scale value to make the module more sensitive to volume changes.
Vary the
Offset value to vary the threshold volume.
These adjustments will interact, so will need to be adjusted in turn.
https://magicmusicvisuals.com/downloads/Magic_UsersGuide.html#AudioModifiers

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