That's really cool! I used the web audio stuff to get real time audio data for interactive visualizations when I did a 5 minute demo of quietnet, the code is available (but might be a pain to get running): https://github.com/katee/quietnet-presentation

Running fully in the browser with visualizations might make a good teaching tool for digital signal processing (although you'd need better DSP code to demo, mine is not a shining example.)