It definitely reflects rhythm. I've tried i-e transitions, can catch just a slight change of the angle, should be different formants [1]. Spectrogram looks lik

It definitely reflects rhythm. I've tried i-e transitions, can catch just a slight change of the angle, should be different formants [1]. Spectrogram looks like a closer match, online demo with mic and some samples [2]. I can't imagine person reading it, it is like watching Matrix. [1] https://en.wikipedia.org/wiki/Formant https://en.wikipedia.org/wiki/Formant [2] https://musiclab.chromeexperiments.com/Spectrogram/ https://musiclab.chromeexperiments.com/Spectrogram/