The effect can be seen / heard on the demo page http://mohayonao.github.com/pico.js/index.html,
if you switch to another browser tab (Firefox 17) the sound stops, but not completely, every second some broken sound can be heard.
I would expect the sound would pause or play further (or make it an option).
fixed: issue #1, the sound does not stop when switching browser tabs …
Ok, I fixed it. Please check the sound once again.
Alright, problem is solved.