@Supremative Thanks, that guide was very helpful. Im currently able to use it to change the scale of a sprite applied to my character as a test. But What I’m really wanting to do is to use this method to affect a parameter in a material.
This parameter for Intensity.
This material is currently applied as an instance to a plane that is attached to my 2d character. It floats in the background from the spring arm the camera is attached to. Like a background.

I cant for the life of me, figure out how to send these sound values to the material instance on the plane?