No-one's solved this yet
(reposting as it may have been missed):
http://i.imgur.com/NsGQqWd.png
It's from the sound received from base #9, happend to notice what looks like a data burst just after the image.
I slowed down the sound by half (
0.5 speed) to try and transcribe the UL more easily, and the above jumped out at me - looks like the
alien numbering system but not in any order used in the main message. Someone with more skill may be able to tweak the image/sound enough to get a clear reading.
I only recorded one message, the first one from base #9 Mel 22 Sector YU-F B11-1 AB 5 A before my link exploded (doh).
If someone wants the audio,
here it is
First hunch is it may be an identifier for the base/mothership, if so each base should have a different code after it's audio messages.