Windows] Normalize the volume of your MP3 files with QMP3Gain | dotTech
Reminder that Spotify defaults to “Audio Normalization” of Normal, compressing the dynamic range of your music even if you have download quality set to Very High. This is a volume normalization feature
Batch normalizing a large number of files (OSX) - Polished Mix
Normalize Audio Volume Levels in your MP4 Videos with MP4Gain
Loudness Normalization – produce New Media
Normalize | otom
How To Normalize Volume in VLC
Audacity: Normalize Effect (Mac OS X) | AudioAcrobat