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Precision Acoustics offers Central Auditory Processing (CAP) Disorder evaluation and therapy materials authored by Jack Katz, Ph.D. and Cornelia Fletcher. All recordings, manuals and score forms have been developed by these authors. Established in 1985, Precision Acoustics is the world’s sole source provider of these products. Any other recordings or materials supplied by other distributors are not the originals and normative values may not apply.