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Yes, that is correct. In that case, we should first average the range and value to percentage. (I had not noticed).

100 - ($Percentage-value-to-re-scale)

The practical use I intend to be able to emulate Auto Duck or parallel compression effects, copying values from one track to another and then invert.

But I'm sure there are infinite other uses for this function. Invert gradients of expression in a precise way in specific sections, experimental effects, etc.