audio story builders

hi, can anyone help!? im looking for an audio story builder...id be interested in an app that not only gave visual references but audio too? my son is newly diagnosed and they were very surprised at the assessment that he is an exceptional fast audio learner...he only has to watch an episode of something special and he can do the script, the words and the signs... so although alot of autistic children use visual signs, on its on this isnt enough to help my son...ive been searching and as this is only a very early disgnosis (like 2 weeks ago!) i can not find what i want...ideally where i type in the story and it reads it back to me/my son...to be honest i didnt even know you could get apps for your fone for autistic kids!