# How can I know the true range of the values returned by AudioLocalMeasurements?

I need to normalize the values of different AudioLocalMeasurements results but I can't seem to find any info regarding the range of values in which each measurement is expressed.

For example, I am assuming that the SpectralCentroid, which should be expressed in hertz, probably has an interval similar to that of the audible spectrum, but it seems Wolfram has no documentation on this.

Is there a way to sort this out in Mathematica or should I be looking for external sources about the standardization of audio descriptors?