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"Just a note to tell you how happy I am with the work that you did in transferring my old acetate ABC Radio program recording to CD. Although it was still playable the chemicals in the acetate were deteriorating and it would be just a matter of time before the surface would begin peeling away from the metal base. The transfer you made is ..."

Diffraction

The bending of a sound wave, as it passes over an obstacle. The angle of diffraction is a function of wavelength.