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"I am writing to say thank you for all of your excellent hard work and great results on my Christmas albums. The fact that you were able to take LP's that are over 30 years old and achieve the results that you did is amazing. I am very, very, pleased with your work. My family has listened to the CD's many times in the past few days. I have been ..."

Diffusion (of sound)

The extent to which sound waves are broken up by uneven surfaces.