MediaMaster 4.1 is the latest version of ArKaos Pro media server software. New features include new aspect ratio and cropping tools; new hue, saturation, and lightness tools; layer-based volume control; sound balance; pause function; and a redesigned interface. The update adds more protection via an optional dongle, and the new version is no longer restricted to use on only one system. A redesigned licensing system allows the user to register and deregister any machine remotely from an online account. Also new is an extended fixture profile with more than 70 parameters per layer, as well as timecode support. ArKaos is distributed in the US by A.C. Lighting Inc.