Coming about nine years after the 3.0 series and one a half years after version 3.10, Audacious 4.0 is the biggest update to date of the popular audio player. The major new feature being the switch to Qt 5 by default for the graphical user interface instead of GTK. The change was made due to the Qt UI being quite polished and looks to offer the same level of usability to those used with the older GTK2 UI. It also adds some much-needed improvements like an easy to sort and navigate playlist view and an equalizer presets window.