Jeff, I thank you very much for your very valuable explanantion and input on this subject. I appreciate it very much.
I have problems explaining things this well and without drawing, is almost impossible for me.
I believe that this thread, being so informative, should be kept, together with other stuff that has value, in a dedicated section on the board.
Maybe Cam or CD can create a place for valuable tech information, in a way we cann all read, but not reply to, or reply subject to verification, to prevent degeneration.