I have complete 0 knowledge about audio visualizing, so take that account in my reply <img src="{SMILIES_PATH}/icon_e_smile.gif" alt=":)" title="Smile">
https://www.scirra.com/manual/109/audio
You might use some of these:
AnalyserFreqBinAt(Tag, Index, Bin)
AnalyserFreqBinCount(Tag, Index)
AnalyserPeakLevel(Tag, Index)
AnalyserRMSLevel(Tag, Index)