I've no experience in analyzing audio, but I did notice this while looking over audio effects, today: https://www.scirra.com/manual/109/audio#h2ix10
And here are the associated expressions: https://www.scirra.com/manual/109/audio#h2ix11
Something like this, maybe?
Edit: I like how after posting about the analyser, two more posts with less information were posted, hahah. More users posting the better, just maybe if you guys down below could provide more info, that would be better.