Well, yes. It would be hard to code sounds outside of the reality bubble. But would it be so hard to assign a certain attractiveness to overmap tiles? Here’s a crude example:
Independent of the player hordes that are hanging around the overmap would have a certain chance to wander from one tile to another based on what it is. More sound and movement being more attractive, naturally. Prioritizing things like military outposts (the guns firing), cities (car alarms, looting, etc), swamps. Without listing everything you get the idea.
When the player decides to start doing something loud, instead of having the hordes head straight to them simply make that particular overmap tile more attractive. Increasing the chance that the horde drifts towards it naturally.
Importantly the whole horde shouldn’t show up at once, and if possible they should only spawn from the cardinal direction the horde is heading from. So fast zombies like dogs, ferals, predators etc show up ahead of the masses, followed by the slower bulk.
Incidentally if the above is possible I wouldn’t say no to a new boomer that gunks players in a horde attracting goo.
