There is a device called "teacher" that was being developed by a
gentleman in Washington (Spokane, I think). It showed some promise. I
had a friend with a child that has Waardenburg's syndrome and was deaf.
The only reason they didn't go with it is the inventor is... um... less
than socially adept.
If you are interested email, and I'll try to get the info for you.
Audiology Services for Montana
arsias at cyberport.net