Normalising audio means adjusting the volume of an audio signal so that the loudest part of the signal reaches a specified level, usually the maximum level possible without distortion. This ensures that the overall volume of the audio is consistent, making it easier to listen to without having to constantly adjust the volume. Normalising can be useful when you have audio files that have different volume levels and you want them to be more consistent, or when you want to make sure that the loudest parts of the audio signal are not too loud and do not cause distortion.
It's worth noting that many audio professionals recommend setting the maximum normalisation level to -3dB instead of 0dB. This is because a level of 0dB can sometimes cause distortion or clipping, which can result in unwanted distortion and reduce the overall quality of the audio. By setting the maximum normalisation level to -3dB, there is a bit of headroom to prevent any unwanted distortion or clipping, while still maintaining a consistent volume level throughout the audio signal.
-3dB is the default normalisation level in Sodaphonic.