The computation of the loudness is based on how the human ear actually perceives each range of frequency. It provides a way to obtain an overall uniform perceived loudness over a track or a set of tracks. Replay gain is a proposed standard that is (more or less) respected by many open-source tools. However, if the stream you want to normalize consist of audio files, using the replay gain technology might be a better choice. These are listed and explained in the reference and also visible by executing liquidsoap -h normalize. To tweak the normalization, several parameters are available. In some cases, dynamic normalization also creates saturation. This can lead to a volume that is too low, too high, oscillates. However, this operator cannot guess the volume of the whole stream, and can be ``surprised’’ by rapide changes of the volume. If you want to have a constant average volume on an audio stream, you can use the normalize operator. Normalization and replay gain Normalization
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