@ada Oh, just imagine if that would work! Amazing!
I still remember this app that wanted to do file transfer via sound, super cool idea but I don't know if they ever got it to work. And I can't find it now … Oh right, in the end they obviously only used sound to magically connect to a server that then did the file transfers +___+
@jfml a neater solution would be to use the sound to do offline signaling and then connect p2p with WebRTC