I am not hard of hearing, but I have always thought my ringtone was quiet. I recently bought some custom mp3 (popular music) ringtones. I noticed right away that my new ringtones sound substantially louder than the built-in tones I was using.
I know it's not exactly what you were asking for but perhaps it's a solution. Good luck finding something to solve your problem.
I just purchased H-P iPaq 6515. I am also hard of hearing. This phone has a very low Ringtone, even when set to the maximum. Can you recommend software that will work with this phone to improve the Ringer? It is powered by Windows Mobile. Thanks Please resond to email@example.com