SCS Software completely overhauled the game's audio mixing and sound effects in 1.39. This update vastly improves interior cab sound mixing, separates acoustic environments for outside and inside the cabin, and adds more realistic turbo, engine, and air brake sounds. Crucially, it provides a much better experience for players utilizing the MODS Studio or custom engine mods. 4. Gameplay & UI Enhancements
Update 1.39 was notable for its range of enhancements, from a refreshed user interface to major gameplay additions. Here's a detailed look at the key features, documented by SCS Software: american truck simulator 139 download new