Auditory processing is not just about listening. Filtering and discriminating important information from extraneous noise is needed to process speech correctly. Also important is the ability to group sounds (into words and sentences) and discern pauses and intonation that help identify both the meaning of the words as well as the emotional intent with which they are spoken. Auditory therapy can help greatly with this. Here’s an interesting article regarding auditory processing and dyslexia from Science Daily:

http://www.sciencedaily.com/releases/2013/02/130219172159.htm