Operation
ReplayGain works by first performing a psychoacoustic analysis of an entire audio track or album to measure peak levels and perceived loudness. The difference between the measured perceived loudness and the desired target loudness is calculated; this is considered the ideal replay gain value. Typically, the gain value and the peak value are then stored as metadata in the audio file, allowing ReplayGain-capable audio players to automatically attenuate or amplify the signal on a per track or per album basis such that tracks or albums play at a similar loudness level. The peak information can be used to prevent loud songs from clipping.
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