SuperMp3Normalizer enables you to automatically optimize the volume level in your MP3 files. It analyzes each file and makes dynamic adjustments to achieve an even volume level across all songs, while at the same time preventing portions of a song from becoming inaudible as a result. The program can process single or multiple files, and by default saves your normalized files to a new folder, keeping your originals unchanged. An integrated audio playback allows you to compare the before/after sound of each processed file by switching between the original and normalized version. SuperMp3Normalizer will maintain your original ID3 tags.
The license of this software is Free Trial Software, the price is $24.95, you can free download and get a free trial.