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Very cool! A lot can be done with the web audio API.

We used it to sync audio across devices to create one huge stereo; all play same audio in unison.

Here's a demo vid of 50 people & their devices blasting a public domain song http://vimeo.com/71647538 in sync.

We're a bit weary of blasting the "good," music across devices in any demo due to the public perfomance copyright act.

That is interesting...assuming you can address individual devices and get some concept of relative position you can likely create some pretty interesting psychoacoustical effects with that many point sources. Probably highly dependent on being able to control relative latency though.

Actually what you speak isn't hard to do at all.

We have a long list of ideas (one you speak of and many more) we'll be shooting video of in the coming days and weeks.

We're thinking there are a ton of use cases and innovative/interesting things that can be done using http://SpeakerBlast.com :-)

That's 50 peoples' smartphones or smartphones, tablets and laptops all playing at once?

It was a mix of conference attendees' iPhones & iPads. I didn't instruct anyone to use Chrome on their laptops.

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