I found this article, by a profoundly deaf composer, to be very interesting. It reminded me of a deaf classmate I had in high school who became quite a skilled drummer, unable to hear the beats but able to feel them, as well as feeling notes from other instruments.
I Think Beethoven Encoded His Deafness in His Music - The New York Times (nytimes.com)
I Think Beethoven Encoded His Deafness in His Music - The New York Times (nytimes.com)
John