What is "replaygain"

ReplayGain is a proposed standard published by David Robinson in 2001 to measure the perceived loudness of audio in computer audio formats such as MP3 and Ogg Vorbis. It allows players to normalize loudness for individual tracks or albums. This avoids the common problem of having to manually adjust volume levels between tracks when playing audio files from albums that have been mastered at different loudness levels.

ReplayGain is now supported in a large number of media players and portable devices.

Although the de facto standard is now formally known as ReplayGain, it was originally known as Replay Gain and is sometimes abbreviated RG.