Students with Dyslexia or a Learning Disability in Reading often need more time to read than do unimpaired readers. Dyslexic readers have to put time and effort into decoding that should be automatic and fluent. Not only does this slow their reading rate, but it undermines their ability to derive meaning from what they have read; once they finish reading they may not recall or understand what was read.
Books on MP3 files are an invaluable resource for Dyslexic readers by helping them compensate for their slow reading rate while they acquire content, language and vocabulary. This technology can support them through Graduate School. I strongly advise taking advantage of Learning Ally as early as Third Grade.