 For material intended for broadcast, the final mix must also comply with all applicable laws governing sound mixing (e.g., the CALM Act in the United States and the EBU R128 loudness protocol in Europe).The different names of this profession are both based on the fact that the mixer is not mixing a live performance to a live audience nor recording live on a set.That is, he or she is re-recording sound already recorded elsewhere (the basis of the North American name) after passing it through mixing equipment such as a digital audio workstation and may dub in additional sounds in the process (the basis of the European name).