The biggest change in Ardour 6.3 is a new Loudness Analyzer & Normalizer feature designed to normalize the loudness by analyzing and calculating the Loudness (LUFS) of a session or a range selection and adding a gain-stage to the master-bus. It also includes a ???Conformity Check??? for various common distribution targets, including Amazon Music, Apple Music, Deezer, Digital Peak, YouTube, Spotify, SoundCloud, and CD. The Loudness Analyzer & Normalizer feature can be accessed from Preferences Mixer Master.