And there's no standard for where and how ReplayGain info is stored each implementation uses different formats and puts the info in different locations. Not all audio players/decoders know how to read and use ReplayGain information stored in metadata. If audio data was also changed, the metadata can contain "undo" info. The volume-change information can be very precise. In the metadata method, information on both types of ReplayGain (Track Gain and Album Gain) can be stored. Calculate the volume level and adjust a multiplier level in the mp3 data.Calculate the volume level of the file and add a new tag, letting compatible programs adjust volume on the fly.Mp3 volume level data can be adjusted losslessly, just as a JPEG picture can be losslessly rotated. The technique is used by a number of programs and the levels are calculated by an algorithm called ReplayGain.
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