The Sound Normalizer improves and regains a quality of MP3 and Wav files. It is reached by the test and normalization of the level volume MP3 and Wav files. It allows to fulfill the test and normalization separately for each channel. It contains batch processor and it allows to fulfill the batch test, batch normalization and batch converting of MP3 and WAW files. The wav normalization and test is fulfilled on a peak level (Peak Normalization). The MP3 normalization and test is fulfilled on an average level (RMS normalization). The MP3 normalization is fulfilled under standard Replay Gain. The Sound Normalizer also allows editing ID3 tags with support for ID3v1 and ID3v2 tags, converting WAV to MP3 files and MP3 to WAV files (build-in WAV/MP3 Converter) using Lame MP3 Encoder 3.97, listening MP3 and WAV files using the build-in audio player.