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Did quick search, no silent voices there. At least i found none.
At 1:28 and 1:40 there are some very high-frequency beeps. You guys might have missed that, because older people lose the ability to hear that high frequencies. Both sound to me like .-.., though the first one is sped up and more silent
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High frequency beeps? They are low frequency. Nobody can hear extremely low frequencies.
I'm quite certain that the sounds at 1:40 mean "ED" and not "L", which seems to further confirm we're heading in the right direction. I pitched that section up so I could hear it (sounds ugly, but it works). The first "beep" is clearly distinct from the other three.
Edit: I added this to the wiki.