
It sounded everything in the world to me like random values going through a pentatonic scale quantizer, so I was assuming it was someone who got their Eurorack setup to broadcast on shortwave. Honestly, this makes me even more sure of my hypothesis that it isn't a "cipher" at all. One user on the discord server actually managed to split this signal for us into their **4** respective tones, unfortunately due to drama it had been forgotten all this time. I would consider this to be a likely source of the signal, given the difficulty of demodulating a clicky signal like this. This Flash demo has been around since 2006 or so per Internet Archive, and it opens in IE11 (wouldn't play in Firefox 60/Flash 22). Impressive find! They do sound remarkably similar.
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Would have to do an indepth analysis on the tones to see if it really is random or if it's actually data. Its a far stretch, more info would be needed to confirm or deny this. The sound seems to be slightly randomized each time the page loads, so you might want to refresh, but it sounds similar enough each time. If someone would like to check this then maybe we can put this one to rest.

It appears that someone has simply broadcasted one of the sound demos (presumably for a prank) and it's been interpreted as a cipher. I'm not really confident enough (about editing) to simply edit the wiki page, but I'm pretty sure I've found the source of this signal. I heard a sound so like this that I nearly fell out of my chair. I was randomly trawling through some websites presented by when I came across a website of various flash demos.

I heard this a few years ago and it stuck in my head for some reason. Just several different tones associated with each number, letter, sign or A-D. Usually such as DTMF has several different sounds, even also with no carrier tone.
