Player: v1.48n:197BAA1
When a trapdoor is pre-assigned zombies, every zombie that comes out makes a zombie noise. I am not sure if this is intended or not; I thought the noise only applies to when a regular lemming is turned into a zombie.
if it is intended; I doubt I'd like this, it sounds annoying.
Not intended. Not sure if it should be kept or not, it's a good warning that "another zombie has shown up". Perhaps it should be a different (or fainter) sound from normal?
Fixed for the next update.
To give a warning of the presence of zombies, I've implemented a different (and intentional) change: On levels that contain zombies (whether preplaced or spawning later), the zombie sound plays instead of "Let's Go".