how can-i manipulate sound (<audio>) in javascript cross-browser?

Question

I am using API from HTML5, it's realy cool but how can I add effects to my sounds?

Example:

1) add reverb

2) increase or decrease basses or acutes

3) control panoramic sound (left / right)

It's possible to do that? How? Is there a library for doing that, which is crossbrowser?

Thank you.