MP3Gain

Developer(s)	Glen Sawyer
Written in	C
Operating system	Cross-platform
Available in	English, Bulgarian, Catalan, Czech, Chinese (Simplified), Chinese (Traditional), Croatian, Dutch, Finnish, French, German, Greek, Hebrew, Hungarian, Italian, Japanese, Korean, Polish, Portuguese, Romanian, Russian, Serbian, Slovak, Spanish, Thai, Turkish, Uzbek[1]
Type	Audio normalizer
License	GPL
Website	mp3gain.sourceforge.net

MP3Gain is an audio normalization software tool. The tool is available on multiple platforms and is free software. It analyzes the MP3 and reversibly changes its volume. The volume can be adjusted for single files or as album where all files would have the same perceived loudness. It is an implementation of ReplayGain.

Modification[link]

MP3Gain first computes the desired gain (volume adjustment), either per track or per album, using the ReplayGain algorithm. It then modifies the overall volume scale factor in each MP3 frame, and writes undo information as a tag (in APEv2, or ID3v2 format) making this a reversible process. The scale factor modification can be reversed using the information in the added tag and the tag may be removed. MP3Gain does not introduce any digital generation loss because it does not decode and re-encode the file.

References[link]

External links[link]

• Official website
• MacMP3Gain, the Mac version's webpage
• easyMP3Gain, a Linux frontend for MP3Gain
• JavaMP3Gain, a java frontend for MP3Gain