Special Effects scene Props

[Looter]

In Napol. Wars dlc certain scene props are available that generate a particular sound, such as the nighttime town scene ambience, wind, storm sounds, blacksmith, etc. 

These sounds are already in native, but not in scene prop form unlike in nw.

I wonder how these even work and if any such things could be made for NI, a few of those sound effect props using sound files drawn from native could go a long way in adding depth to maps.