Exposing AudioContext

I want to make my own milkdrop/butterchurn but to do so I need a way to get to audiocontext right? How can I do this with webamp?

I think i may have asked this years ago but now i RELLY want it. Im making audio reactive shaders and I also want to make an extension for shadertoy, but I cant with the current code can I?

Ill just hack whatever, but a standard approach would be nice and I dont see it (Im dumb so it way just be me).