You can use the track normalization
feature in RadioBOSS.
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.
Process multiple tracks using the Music Library
1. Add tracks to the library and select the ones you want to process.
2. In the top menu, click Tools->Process Tracks.
3. Click the "Start" button in the "Normalize" area. If necessary, you can change the target level value.
You can proces one track using the Track Tool
: click the Auto button near the playback level slider.
For best results, it is recommended to have all tracks processed.
If you have scheduled music library updates, you can also make it process new tracks automatically.