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Data over Audio
Know of any apps taking advantage? Chirp and Gem Swap by the same company are the only two I can find. I was thinking this could be useful for carrying MIDI data, maybe Link. I could imagine MIDILFO's sending data via modulations. I think the common way to carry around 19khz - inaudible but still receivable by a good many devices. Audio is also connectionless, so no internet or pairing required Chat clients, file transfers etc., are other uses.

Comments
Here's a link which explains more about Chirp. http://www.chirp.io/#overview
well, you know:
https://itunes.apple.com/us/app/pixivisor/id601279460?mt=8
Thanks!