MP3 Gain is a mac software that can increase audio volume and normalize it to a uniform loudness level.

With MP3 Gain for mac, you can effortlessly and quickly increase the volume of your audio files without worrying about degrading the quality. It automatically normalizes the volume of your audio files and increases them to the uniform volume target that's in accordance with the EBU R128 loudness standardization specification.
The software uses statistical analysis to determine how loud the file actually sounds to the human ear, ensuring that your files sound great. One of the key features of MP3 Gain is that it supports many audio formats such as mp3, wma, wav, flac, m4a, ac3, mp2, and ogg. It also supports batch increase of the volume, making it easier to handle multiple files at once.
It's worth noting that MP3 Gain doesn't support DRM-protected audio files. However, for all other files that need a boost in volume, MP3 Gain is the perfect solution. You can try it for free and see how it can enhance your listening experience.
Version 4.0.0:
1.Improve audio quality with new algorithms
2.Easy to use with new interface.
3.Support wma, wav, ac3, flac, mp2, ogg audio format gain(IAP).
4.Fixed some other bugs.