I can confirm this really sounds like the CubeBug-1!
In fact, thought we haven't heard it ourselves, from reports of other
people, we are now almost sure the central frequency has shifted to
The quality sound quality of your file sounds pretty good, though
there's are some low frequency components that sound a bit weird at
248Hz and 744Hz.
Can you see how much time there is between beacons?
Thanks a lot!