I needed to create what's known as side chain compression in real time using the Web Audio api but it doesn't have that built-in functionality. It does have the ability to change each of the params AND it has a setValueAtTime method but that has NO CALLBACK which is crazy! So, I turned to good ole GSAP and thought I'd post the results here for anyone who might be able to get something out of this. I haven't been in here in a while so wanted to at least contribute something.
Hope it helps someone.