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for this kind of sound you don’t need it to be 3D because it will always loop at the same level whenever you go at the map, so don’t use Attenuation. instead you can import the (wav) file and then add it as a component to the main pawn or any game object and then set it to auto activate or trigger it with event begin play… you really have plenty of options with that keeping in mind changing zones of map and changing sound according to it like entering a closed quite place, in that case you will need Attenuation to simulate the area but remember to make the wav file mono in that case.