I've configured the audio settings in the settings menu to 0% for both sound and music. Despite this a couple of rooms still generate sound when they are zoomed in on. Specifically the bar. Since the 1.2.1 Halloween related update the cafeteria and the barracks are also generating sounds. Additionally, when Fallout Shelter first starts I briefly get background music before it seems to remember my settings and stop. This occurs using the latest version of the application on a Samsung Galaxy S5 device.