A loudness-leveling standard that stores a gain offset so playback software can match perceived volume across tracks without altering the audio.
Gain normalization is a process that measures the perceived loudness of a track and writes a gain offset value into the file's metadata tag (the ReplayGain standard). DJ software that reads this tag can automatically adjust playback volume so tracks land at a consistent level without touching the original audio.
Why it matters
Without normalization, jumping between a heavily limited commercial release and a dynamic older track forces constant manual gain corrections mid-mix, pulling focus away from the performance.
In practice
Enable ReplayGain analysis in your library software before export to USB. Disable the playback adjustment in your DJ app if you prefer to ride gain manually per track.
