I accessed your message because I was looking for some reference in the
internet to the function of the pinnae. So far I haven't found any reference
other than to the task of gathering incident air waves and funneling them
into the outer ear tube.
I am working on a theroetical project that may assign ablative acoustical
function to the pinnae.
If this is your area of research, perhaps you might be interested.
jongil at ctv.es