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I've seen a couple of sites that offer the files in differing bitrates, file sizes roughly 2-3 times as large. I suspest the CDs that can be bought likewise are higher quality. Also, I've got a few cassettes that were commerially recorded and they are very decent. Old radio had an upper limit of 10khz at best so an audio cassette with its analog recording probably will sound better than a CD or mp3. Question would be whether the cassette is recorded from a record or tape or from a digital source.
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