Mp4Gain

Mp4Gain is a straightforward application that helps users normalize, and change the tempo and pitch for various audio files.
It sports a clean and straightforward layout that gives users the possibility to add files to the list using the “drag and drop” support or built-in browse function.
Mp4Gain works with a wide range of file formats, including video files, as you are able to alter the sound for clips as well. This way, you can upload files with MP3, MP2, AAC, AC3, FLAC, OGG, WAV, MP4, FLV, AVI, MPEG, 3GP, WMV, or other file formats.
The program offers support for batch processing, which means you can add multiple files to the list and manipulate them at the same time.
What’s more, you can make the utility maintain the original bitrate and sample rate or change their values with custom ones, adjust the tempo and pitch level pretty easily, thanks to its built-in sliders, copy the original tags, trim the items, as well as play the audio files directly from the primary panel.
Other important functions worth mentioning are represented by the possibility to apply ReplayGain effects, select the audio quality (high, medium, or low), choose the saving directory, save the processed items to the same folder as the original files, and replace the existing items.
During our testing we have noticed that the tool accomplishes a task quickly and without errors throughout the entire process. It manages to remain light on the system resources, so it doesn’t burden the overall performance of the computer.
All in all, Mp4Gain offers a handy set of parameters and an intuitive layout for helping you change the pitch and tempo of audio files, and normalize songs.