Via a comment of Ned on this blog, i came to know the impressive library audiolib.js of Jussi Kalliokoski.
I made a quick example of how you can connect the midibridge with an Oscillator, see:
http://abumarkub.net/midibridge/examples/audiolib/
This is just a very basic example, you can do a lot more with audiolib.js, check GitHub for code and documentation.