Quoted from Hazoff:
If you're like me and would rather have zero call outs in this came, well unless really good one are eventually implemented then game adj # 102 Speech Attenuation turn up to 60, #101 Music Attenuation turn down to -60 and the hillbilly disappears, I like also that the music is louder, love the music in this game which is rare for me with pinball machines, anyway give it a try. It didn't affect the Zombie noises but does affect the dynamic's of volume during gameplay, although with out the call outs no need to lower music volume. I think its better, you might like it too.
I would hope that they go towards a sound a like or better yet actual actor from the show. I overheard 3 casual players last night commenting last night during their game on route about how it sucks that a Walking Dead pin has no characters or voices from the show in it. It's not just hardcore pinside people, casual players don't understand it either.