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+MP3Gain analyzes and adjusts mp3 files so that 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.