I have been looking for a music equalizer script or a plugin for awhile now but all i could find was one that didn’t move to the music it just went up and down. i listed a picture down below what i am looking for.
This is not possible sadly, PlaybackLoudness is not an audio signal, it is a value that updates once per frame. Try suggesting this in feature requests, as I agree that it could be useful.
Your best bet will be to have it as randomized as possible and maybe incorporate Sound Volume if you change it frequently enough.
If you have trouble with that, let me know and I will be more than happy to help!