Note that if a groove in an analog sound recording has either been
damaged through "wear and tear" or through some inaccuracy in the
recording process, the best that can be done is to attempt to
recreate the waveform that "should have been there!" Playing such
a disc will...MUST...produce only the "damaged" waveform as it
exists when played, since the playing stylus has to follow the
incorrect but actual existing path. This makes "restoration" of
the original content a subjective, not objective, process...