What actually happens in X-Pert Playout when normalizing?

Performing a level shifting

X-Pert Playout does not process the source sound internally. It normalizes the loudness of the whole programme (file-based playout channel) by adjusting the audio levels. For example, if there is a source file with average programme loudness of -32 dBFS, it will be increased with 9 dB in order to reach the referent -23 dBFS specified in the X-Pert Playout output settings.
 

Keeping track of the maximum true peak level of the audio.

 

If the maximum true peak level exceeds zero dB, there will be a clipping introduced. If the maximum true peak level exceeds the specified value in the X-Pert Playout output settings, X-Pert Playout assumes that the source content is not prepared in a good way by the sound engineer. In such case, X-Pert Playout will not reproduce the relevant media source.

Let us follow the latter example with the source file having average programme loudness of -32 dBFS. If the maximum true peak level of this file is -8 dB, increased with 9 dB the peak will jump to 1 dB (above zero). Exceeding the zero will cause clipping. And exceeding the maximum permitted value (by recommendation: -1 dB) will cause skipping the playback of such source.