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You can normalize music tracks in RadioBOSS in order to make them the same volume level. RadioBOSS uses EBU R128 standard to determine loudness. Normalizing does not change or re-encode music files. Any level corrections are reversible and do not reduce sound quality.
To normalize tracks, use the Tools->Process tracks menu command in Music Library to batch process music tracks. You can also use the Auto button near the level slider in Track Tool to normalize a single track. It is also possible to automatically build a library and normalize tracks using the makelibrary scheduler command.