The Tinnitus and Hearing Clinic - Were Expanding!
Auditory Processing Disorder is when the ear hears but the brain does not process the signal 100%.  Standard hearing testing, the audiogram, only checks the functioning of the ear or about 10% of hearing.  If your hearing is normal but you are still having problems hearing, you might need to exercise your ears.
How can exercise help?  Hearing is noise is a common complaint. Some people naturally do better in this area than others.  It is a trainable skill.  
Look at the picture below.  How many faces can you find?  
Some people can look at it and find all 10 with minimal effort.  Some will never get all 10.    But once the faces are pointed out, you will be able to look at the tree easily see the faces. 
The tree in this case is visual noise.  This is the same principal with hearing.  Once you learn to ignore the noise, it is easier to pick out what you want to hear.
Children with an auditory processing disorder are often labelled as "not living up to their potential." These are usually intelligent children who are behind a year in school.  Problems usually develop when the school curriculum becomes more auditory/verbal around the age of 9 or 10.   Often times parents have had their children tested several times only to be told their hearing is "normal" when only auditory acuity or the functioning of the ear has been tested.
Adults can also develop this problem later in life. Listening is a learned skill. and use it or lose it is certainly true.
Where are the exercises available?
There are several very good, extensive computer programs that are available.
Or maybe you want an app for your iphone.