Yes it has changed.RedWizzard thinks the sounds may have changed for the UA in 1.3 can you guys check this video of his to see if there are differences?
https://www.youtube.com/watch?v=8ynwPcJyNvw
Do you know if there are any full recordings of a 1.3 artifact? At least the purrs and so on are limited now. Would be important to analyse the sequence right from the point of drop out from cargo scoop. For example: if the sound sequence is triggered by the drop out and not encoded by a time-stamp the sequence would have at least the same length every time after drop out.
If not we should analyse this time stamp encoding. For example by dropping 2 artifacts in the same instance, 10km away from eachother, starting recording at the same time to hear if their sound is the same. Then we should do the same thing in two different solar systems to learn if there is some positional encoding, too. If not the sound would stay the same - if the testers start recording at about the same time.
In that way we could rule out if the artifacts dropout position is important to encoding the message. And if the time stamp is important it could also be that the artifact does different noises on different times. Probably it gives a very special message at a special time.