LameXP does support volume normalization, but it's completely optional.
Also normalization does not happen by writing any kind of "normalizing data" (whatever that is supposed to be) to the file.
Instead, if (and only if) normalization is enabled, the source is decompressed first and then the audio is normalized via SoX before it is sent to the encoder.
Again, this is optional and it is disabled by default (see the "Advanced Options" tab). I have no idea what kind of info "MediaMonkey" displays.
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