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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 ..."

Distortion, harmonic

The appearance of harmonics of the applied input signal, as measured at the output of an electronic component.