Bill - Perhaps you could request some info from CHS, as I know they have plenty of info on it ... I'm actually quite surprised that in your 15 years of various classes recruitment, hyperacusis, and other very common conditions with accompany many (more than 70%) of people who have hearing loss (mild -> profound+).
I know that the hearing help type classes offered here cover these topics in even the most "basic" classes because soooo many people have either or both and need information on recognizing it and then managing it.
odd.