Appreciate the feedback! I am the one who's worked as Sound Designer and Composer on this new update.
I was more concerned about making them sound similiar, since their only function is to make players navigate around to look for a highlighted character; Either a glowing, red survivor, or a glowing, yellow, Carrier. I thought it important that the zombies have a similar sounding sound-design across the board so that players, with time, can know what's going on by simply listening to the style of the sounds being played.
I did make them sound different, though, but as you said the differences are quite subtle to begin with, but become more apparent as the "cues" are heard more and more times. At least, I hope that will be the case, otherwise we'll have to review them based on the feedback from the community!
I don't think piano notes, especially the notes from the theme song, fit very well amid gameplay. They would dictate the mood of the cue a bit too much, if that makes any sense, and it would likely confuse players who enjoy listening to the soundtrack while playing the game.
KaempeLaeske
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