Apply your NoiseVolume

let’s look at the Noise Volume, The noise volume can be used to set noise in a specific area. And to create one right click in the content browser click “blueprint class “in all classes type “Noise Volume” and once created name it what you like.

Then drag it in the level and you’re going to notice that in the details panel it looks very similar to the “BP_WorldScapeManager” noise tab. But next you need to make it where "BP_WorldScapeManager" will read the volume and in order to do that click it scroll down to the volumes Tab and click the Plus for the Noise Volume list and assign your NoiseVolumBp.

Your going to have to scale the NoiseVolumeBp up by a lot, Recommend at least of a scale of 28000 or 5000000 on all axis for it to affect a large area. And like before experiment with the values that suits best for your needs.