So, the idea is pretty simple - replace, that atmospheric - yes, but really boring background sounds, with some radio broadcasting, it can be something like GNR from Fallout 3 (NV), not the same no ... but having some similar functions:
- entertain survivors by music, not much 5 - 10 tracks will more than enough
- actual news: new zombies/weapons/alliances/missions etc.
- and, of course, atmosphere ...
P.S.: i'm using Google Translate to check my spelling, but seems to me this is not helping ... :)