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Really need not only "Sending loudness rating" but also Receiving loudness rating, Junction loudness rating, and Overall loudness rating. Actually, probably just Loudness rating, redirect this to that, and include a section in that about this. But at any rate, sources

• www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=4&cad=rja&uact=8&ved=0CCwQFjADahUKEwjW29nSlYHIAhXKbD4KHQXRAvQ&url=https%3A%2F%2Fwww.itu.int%2Frec%2Fdologin_pub.asp%3Flang%3De%26id%3DT-REC-P.76-198811-I!!PDF-E%26type%3Ditems&usg=AFQjCNHj8LZwNAax7lkWiXj5ApX-ZNO6Ug&bvm=bv.102829193,d.cWw (bizarrely, the spam blacklist doesn't like that),
• www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=5&cad=rja&uact=8&ved=0CDMQFjAEahUKEwjW29nSlYHIAhXKbD4KHQXRAvQ&url=https%3A%2F%2Fwww.itu.int%2Frec%2Fdologin_pub.asp%3Flang%3De%26id%3DT-REC-P.79-199909-S!!PDF-E%26type%3Ditems&usg=AFQjCNFmiFNeeVBviJXNx3EChP5_zD4iYw&bvm=bv.102829193,d.cWw (or that),

• and here. ~ ONUnicorn^{( Talk| Contribs)} problem solving 18:23, 18 September 2015 (UTC) reply