Hey there!
I'll send a email later on if this topic is not good enough, but I'd like to suggest a feature I would love for ISF: Shadertoy like audio input.
It always seemed kind of unclear to me how VDMX could implement this, but I came accross this shader (https://www.shadertoy.com/view/Xds3Rr) and it made a lot of sense.
Passing a 512 (or any user/shader defined) pixel wide texture of the FFT (or anything available, really) spectrum could unleash a lot of potential, and it does not seem like an huge amount of work would be required on your end, so everyone wins!
Thank you!
M_