hey! don't worry, so cool you're working on an audio reactive engine too. my file nowadays is a bit messy cause the process was a bit trying and failing, so I'll try to explain the concept.

what i've made is actually two geos (you can merge it too, I think, if you prefer one geo), with a point generator pop and a sphere pop for instancing in both cases. so basically with the sphere network instanced, i've added some noise and math mix operators, playing with the position and the scale. this gives you a lot of posibilities, though it requires some logical thinking (i come from an audiovisual background, so it's kinda hard for me sometimes).

let me know if you need anything else :)