A totally fictional analogy.
Please note - this is NOT intended to denigrate anyones work.
Imagine that we are from a civilization that has never seen a car.
We find one and notice that it makes noises.
After lots of work we note that a voice from inside is saying "Smith St", so we take it to "Jones st" and the voice changes.
Now we spend heaps of time trying to analyze the other noises from the car - Engine/water pump/carburettor/etc - and we notice that sometimes the engine note changes and sometimes the lights flash.
All this is important information - but.....
We could analyse its noises and lights for many years and we would not be any closer to working out what a "Car" is for.
End of analogy.
My point - of course - is that maybe its time to look at what The UA's overall function may be - and ways to test it.......after all even if we decode a sound that might be a "water pump" it still does not help in knowing what the UA is.
PLEASE note - this is an analogy - I do NOT think that the UA is a car.
YOu are not a part of the cult of we have move around the UA to different systems and put things beside it and listen to the UA.
What do you think they should do with one?