Ran across this website that I must share! http://www.audionotch.com/faq#who. If you go to FAQ under the question "how do i use audionotch" there is a link to a self tester. You can use a slide bar to match tone to the sound that you hear. While I was messing with it I actually heard the squeal in my right ear (worst one) go away. It's amazing! I'm hoping that we can use this in audiologist's office which would allow her to know exactly what I'm hearing. It would make it so much easier to set up the tinnitus program in my hearing aids. If you have tinnitus please give it a try. Would love to know if other tinnitus sufferers have the same experience I had while playing with it.