I cant find anyone else to confirm what i know i heard... and i didnt record it as i wasnt expecting anything...
But i heard a recording as i scanned...
So, I had a look myself and i think i know what you mean (starting at ~3,5sec):
https://soundcloud.com/hans-woarscht/2018-01-07-scout-ii-scan-audio
Good news first, there is def a kinda weird sound while you Scan it...cant say if its the usual scanning sound though cause i never paid any real attention before.
"Bad" news now, i dont think (!) that it is some kind of hidden code or message.
I have applied some filters (low/high pass, removed background noise, decreased playback speed etc) and wasnt able to produce anything close to understandable.
The Spectogram also seemed quite normal, you can clearly recognize the given "voices" though.
Another reason against this theory is that it seems realy unlikely that FD would put a hidden code into something that cant be reproduced after the first scan, i mean, its hard enough to execute the scan itself (guess its a bug) ^^
Like i said before, im no soundengineer, so theres still a good chance that i missed something, just seems unlikely to me given the circumstances.
Non the less: Good job Cmdr!
Its always important to pay attention to stuff like this, so dont feel discouraged and keep on the good work.
o7
Edit: The File in the Soundcloud link is unedited...
Edit 2:...and also something went wrong, seems/sounds like one of the stereo channels is missing