>>but the end result, what one hears on the new "enhanced" tape, will always be subjective

Yes this is what I have said in my posts above. My expert told me that in the end, the jury decides what it is they believe they are hearing. However, they will have been assured by the expert witness that what they are hearing is 'human voice' because that is one of the things that the machine does - extract the human voices. If in the Ramsey 911 tape does sound like chipmunks then that rather suggests a child's voice rather than one of a middle aged man!