got to say i disagree with you mel there is no profit in my link it's there to demonstrate the specific nature of the sound wikipedia should not be a dead medium in order to survive and grow it needs to be relevant writing about sound is a like skating about architecture it simply doesn't work in order to convey the material properly one has to hear what is being referred to text no matter how erudite fails to do this the only way to achieve it properly is by using audio to demonstrate the specifics of a particular microphone array i'm terribly sorry you presently don't comprehend this why do i not see any tildes in your signature ty ford