Normalization process could be done if the sound level of media file is not appropriate for playback or burning on CD. That is why, if you wish to burn Audio CD, you could normalize all the files to achieve the maximum sound levels in an all files. There are exist different normalize methods, such as "Peak level", "RMS method" and so on. We could highly recommend to you test all of them firstly to understand what changes could be done with your media files. Also, please remember, if you need to increase the volume level in the existing mp3 file, which you wish to listen in mp3 player for example, normalize functions are very often are the features of waveform editors, that is why decompressing and recompressing could be need, in result you would be able to receive the mp3 file with decreased quality.
