There are literally millions of possible listening situations. From the one on one conversation, to a concert to a crowded room, sounds can be loud, confused, soft and clear or distorted by echoes. Many hearing aids today are better able to cope with a number of different listening situations. By using digital technology, the hearing aid can actually adjust the volume automatically depending upon the situation. If you are only deficient in a narrow frequency band, the hearing aid may amplify only those frequencies allowing other frequencies to remain at normal levels. And in some hearing aids, you can pre-program different levels for different situations. With the push of a button you can change the listening profile.