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Controlling volume differences

If you encode a file by using the Windows Media Audio Professional 9 codec or the lossless format, the peak and average values of the audio signal are calculated during encoding, and those values are placed in the header of the file. During file playback, users can control the volume differences between the quietest and loudest points in the file. This is useful, for example, with content that has a wide range in volume, and a user does not want to have to adjust the volume manually during playback. (This feature is only available when the file is played on a computer running Microsoft Windows® XP, and a player that is built on the Windows Media Format SDK.)

When you use Windows Media File Editor to edit the file, you can specify different peak and average values than those that were calculated during encoding. Changing the values affects the volume difference in playback.

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