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+mp3gain (adjusts mp3 files so they have the same volume)
+
+MP3Gain does not just do peak normalization, as many normalizers
+do. Instead, it does some statistical analysis to determine how loud
+the file actually sounds to the human ear. Also, the changes MP3Gain
+makes are completely lossless. There is no quality lost in the change
+because the program adjusts the mp3 file directly, without decoding
+and re-encoding.