Question How did Keijiro do this? VFX + Audio waveform

So there is this Japanese guy named Keijiro who creates so many wonderful things in Unity. Particularly, the one I am interested in is his LaspVFX package.

He somehow takes the real-time audio (from your mic) and translates it into the waveform, which in turn makes the shape of the VFX graph lines resemble the shape of the actual audio wave. I do not know how to explain it, so here is the video of it:

I am a noobie, so what he does looks like magic to me and to record this video I had to literally place the mic close to the headphones themselves. I am interested in finding out how to do the same thing but from the game itself. How do I take the audio file and make my VFX graph follow the waveform of that audio file similarly to how Keijiro did it?

 

@SeventhString
Isn't he working for you guys? He's been around for long and he list Unity Japan as workplace on github.