I  use a technology on many of my recordings which may appear to be jumbled up auto files. This is intentional and yet effective.  Carefully composed affirmations are recorded sped up and reversed in order to make it imperceptible to the editor in the mind. This technology is very effective. Load onto your MP3 turn down completely so it is imperceptible and put on repeat so that it plays for hours..
Personally i prefer to be able to hear it at least a bit, so i make it barely perceptible then put my Player/phone in my pocket. Being in my pocket renders it completely imperceptible but i know it is playing. They work!!  

Self Improvement