In my latest run through the hearing radius of zombies seems to be very small - or a fairly continuous amount of sound is necessary to get their attention?
Constant gunfire seems to have a modest sound radius for zombies, and melee combat has a small one - but most other player sourced sounds such as air horns, truck horns, whistles and so forth seem to have very little effect.
Depends what the zombies are doing too. I’ve had large groups completely ignore gunfire down the street because they mobbed up into a car, and keep getting drawn in by the sound of other zombies smashing the car in a perpetual cycle.
Yeah, I’ve seen that happen a lot. This particular one was just a diffuse street horde that wasn’t really doing anything at all - they hadn’t settled down to beat up a car or anything like that. They were just scattered pretty smoothly over the entire block, and they totally ignored a truck horn the next block over when I leaned on it - which is not how I remember that going as a rule.