Thanks for the upload. For some reason I can't use the .wav file. It tells me it's corrupted when trying to download it, so I used the sound from the video.
The first noticable purr is at 23 seconds as far as I can tell, and the classified enhanced sound doesn't start until almost a minute into the recording. If anyone can hear anything let me know. Here are two different transcripts with different symbolics.
1. - = High, l = Low. (I believe RiZ@L usually does the opposite, that follows below)
l l - l - - l l - l l - l l - - l - l l - - l - - l l - l - - l - l - l - l l - - l l - l l - - l l - - l l - l - l l - - l - l l -
2. l = high, - = Low
- - l - l l - - l - - l - - l l - l - - l l - l l - - l - l l - l - l - l - - l l - - l - - l l - - l l - - l - l - - l l - l - - l
So there are 66 purrs in the sequence and NO HONKS! The latter is definetely interesting, to me atleast. That means there is another way to differentiate between sequences. Below I have tried to note the times between each purr. It fluxuates a bit, but maybe this can be used for a pattern. Remember, this is spacing between the purrs, so there will only be 65 of them, and they are approximated to nearest 1/2 second.
8.0 9.5 6.5 6.0 4.0 4.5 6.5 5.0 4.5 3.5 3.0 5.0 6.0 5.0 6.5 5.5 6.0 6.5 8.0 7.0 4.0 6.5 4.0 4.0 5.0 6.0 5.5 5.5 6.0 4.0 6.0 6.5 6.0 6.5 6.5 6.0 4.0
I really can't see a pattern here, as the times fluxuate between 3.0 and 8.0 seconds. I also can't spot a repeating pattern in the purrs either.
Be advised though, we are missing about 17 seconds of audio from release until first clear purr is heard (I believe there is a LOW at around 14 seconds, but I can't be sure whether there is something in between due to the thrusters). As the first clear purr is at 0:23 seconds and it is scooped at 6:28 we should have a full set of 6 minutes. The UP also had 6% life left when scooped as far as I could tell. We do however not have any real proof of the signal repeating itself, as the closest we can get is that the last three are the first three, which would fit if the LOW at 14 seconds is the only one before that.
I do believe we need a longer recording of a Free Floater, to make sure there is a repeating pattern here. Another option would be to set up a second commander 150m(?) below the one with the UP and be ready in Classified Cam Mode to record. This will take some trial and error though.
I have purposefully ignored the chirps. Someone else can transcribe those