Listening program questions

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Has anyone had success with Sensory Listening Systems? I have a 7 year old son that is in the habit of humming repetitive bits of music, for example, the first couple of seconds of the "Star Wars" music. This is a problem at home, as it is grating on his parents nerves. It has also started to become a problem in school. At the private OT, they are using "The Listening Program", but I am reluctant to spend such a large amount of money with out reading reviews, etc. I am also looking at a more affordable version called EASe (Electronic Auditory Stimulation Effect). Amazon's sight says it is OT recommended but there are no reviews. If anyone has used these products or has any other ideas of what we can do to help with this auditory sensory need, please let me know.