It is a verbatim, direct, as close to the millisecond as I could get, transliteration of one of Vent's tests. See my previous post. The original audio is in his sig.
It doesn't sound like Morse because I think it's Morse; I think it's Morse because the varied lengths of the spaces between the tones in the UP audio make it sound an awful lot like Morse. Also, it translates perfectly into Morse. Problem is the letters are gobbledegook. Some kinda code, just like the UA was, but more complex and more multi-dimensional.
I suspect it's a 3D diagram of some kind, based on how closely the circular diagram resembles a 3D polar coordinates representation (y'know, theta, phi, rho; USE). But how to map the Morse onto those?
So, I've gone back and listened to the originals, and I can't even begin to correlate what's in that midi to what's in the original recordings.
Sorry, I just geniunely can't hear what's claimed to be "clearly morse". If you're referring to the chirps, they've always been simple background noise, reasonably (and sadly) by people who on occasion shun the rules around here.
This is further reinforced by the fact that you explicitly say "Problem is the letters are gobbledygook". The morse of the nearest celestial objects were readily deciphered, and even the grid representation of the ships was readily deciphered.
Honestly, truly deep analysis of this stuff has never led to anything. This challenge is meant to be, and has always been, difficult, but accessible. Even the image in the probe signal is just a case of "record the sound, throw it at a website"... knowledge of QPSK constellations relies on very specialised skillsets, and so I highly doubt it's the correct path.
Go down it if you want, not gonna stop you, just verbalising I think it's the wrong path, because highly specialised/complex analysis has yet to yield any meaningful results in this mystery.