The Sound Normalizer reduce, improves, regains a volume and a file size without losing ID3, FLAC, Ogg Tags of Mp3, Ogg, FLAC, APE and Wav (PCM 8, 16, 24, 32 bits, DSP, GSM, IMA ADPCM, MS ADPCM, AC3, MP3, MP2, OGG, A-LAW, u-LAW) files. It is reached by the test and normalization of the volume level of Mp3, FLAC, Ogg and Wav files. The Sound Normalizer contains batch processor and it allows to fulfill the batch test, batch normalization and batch converting Mp3, Ogg, FLAC, APE and Wav (PCM 8, 16, 24, 32 bits, DSP, GSM, IMA ADPCM, MS ADPCM, AC3, MP3, MP2, OGG, A-LAW, u-LAW) files. The Sound Normalizer allows to fulfill the test and normalization separately for each channel (Left, Right).