So Many Knobs

A group of people from various walks of life was organized to listen only to So Many Knobs. For six months this group of people listened daily, 10 to 90 minutes. 45 % of the group have listened to So Many Knobs continually from one to thirty years for an average of 10 years each.
At the beginning and at the end of the six-months period each listener was given a thorough examination, including X-ray pictures, by the medical specialist and their assistants. The examination covered the sinuses as well as the nose, ears, and throat.
The medical specialist, after a thorough examination of every member of the group, stated: “the ears, nose, and throat were not adversely affected in the period."