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While it is possible that the tape flutter is on the original cassette (caused by the device used to create the recording) I’m going to guess that the more likely source of the problem is the tape player that was used for the transfer, simply because when the recording was made, cassette machines were current, and thus more likely to be in better condition. The more serious of these is tape flutter (rapid tape speed fluctuations, perceived as pitch fluctuations), however this, and both of the other issues, might be due to issues with the cassette player used for the digitzation. stereo imbalance (louder on the left channel).a lack of high frequencies (muffled sound).The idea is to minimize the need for restoration in the first place by ensuring that the initial transfer from cassette is optimal.
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