Don,

Thanks. I've not heard of that use of the term before, but I've not read much on psycho-acoustics, focusing on physical acoustics instead. My reading on psycho-acoustics is arguably also physical acoustics: mainly head-related transfer functions (HRTF's) and similar localization topics rather than discrimination. You wouldn't happen to have HRTF experience, would you? If so, please email me. I haven't had much luck.