I have been trying to interpret them for days now, i just cant do it. I dont think they are just random sounds.
They seem to come every 9(ish) seconds, but its not nearly as constant/fixed as the purr intervals. you can (kind of) track them across the recording but it seems to me that one type of the sounds (that looks/sounds like a small purr, "klacklacklacklack") distorts the intervals someway. (maybe they act as some kind of spacing/divider in the data)
There seems to be 9 different variants of the sounds that are combined in different ways into what looks like morse letters and at least 2 variants of the "small purr" sound.
At first glance they look like letters in morse but if you study them closer some of the "letters" make no sense! Some of the sound variants are more often paired with each other in reoccurring groups (kinda like "words"?) and if you listen very close they sound like each variant have structure within them.
I believe each variant are an individual letter/symbol and they spell out abbreviated words, like a telegraphed message accompanying the location/nearest station in morse. If they are indeed letters, they are well hidden/warped and it makes it really hard to hear. Some of the variants are "long" enough and structured in a way (sounds like it has a pause) that would suggest it contains multiple letters.
9 letters/symbols are not enough to spell out any message tho. If the small "groups" of varants (they usually come in 3 or 2´s) are abbreviations of words, they do not come in repeating sentences. (which is not helping)
9 letters/symbols + the "small purr" would allow for it being the arabic numerals (0-9) but the variants are too "different" from each other to be interpreted as 0-9 in morse-code. And even if it just was a string of numbers with no end or startpoint, im not sure what we would be able to do with it.
9 letters/symbols would also allow for it being an extended harvard spectral classification of stars with the 9 spectral types (O, B, A, F, G, K, M, L, T). Or the 9 different morgan-keenan luminosity classes (Ia-O, Ia, Ib, II, III, IV, V, VI (or sd), D). (both classifications are used in game). Each "word" would describe a system of stars divided by the small purrs. This is wishful thinking on my part tho and i have tried to assign the variants to these with no result.
A lot of people think that the sound is analysed to death and that there is nothing to find but i think this really sticks out.
Remember that the the community, including the "sound engineers apply here thread" could not find the morse (which is pretty obvious now that we know about it) for 2 months and the thirst for solving and the hype surrounding this mystery was much larger back then.
I urge people to try and listen for these themselves and whack their brains at it!
Important to note is that these sounds stay during "sleipnir-like behaviour" (i believe rizal is doing research on what makes this happen) when the background noise disappears and the purrs seem much less frequent. The only thing left in the audio being the purrs, the howls, the chittering and these "tiny sound variants" in question. I think this somehow speaks to its relevance.
