Hi Bill,
OT but, one of my close cousins was born blind and I grew up with him. He had also that intense sense of hearing you talk about, as a kid out on the streets with him many a time he would stop me crossing the street because he could hear a vehicle coming around a corner that I could not see! As an adult he would be passenger in my car and he would would point out some mechanical problem in the engine or running gear by a minute sound! He had a guide dog, (bloody stupid thing it was!) and out on the streets he used to guide the dog and stop it getting into bother! Amazing!
When it came to my audio gear he was the best "test equipment" I had, Just using his enhanced hearing I could set up my turntable, position my speakers, find an electronic fault and many times he would tell me that the absolute phasing of my system was wrong! A close friend was a musician and appeared on many classical recordings back in the day and Mike would listen to the new recordings and be able to tell him every "mistake" that he made! Wow! did I envy his sense of hearing! He continued to adulthood gaining a stunner of a wife and four great kids! he also held down a responsible job for the whole of his working life.
Growing Up with Mike I suppose I very soon forgot about his disability, he himself would say that because he never had sight he didn't really know what he was missing.
As to being "sorry" for hijacking threads? You shouldn't be! If anyone is "uncomfortable" then they have the problem, you have a rather unique gift and communicating what you can do with it to us is eye opening! (no pun intended). Please carry on posting Bill! If you ever come to the UK I would have a job for you, fine tuning my hifi system for me, Unfortunately my Cousin Mike is no longer with us and I could sure use a good set of ears!
Enjoy your Christmas holiday!