Zoe's voice lines are very soft and hard to hear.
I've been playing a lot of Zoe lately and I noticed that the volume of her voice lines have been toned down, so much so that I can hardly hear them over anything else in the game. even tried with headphones can still hardly hear her.
I have Voice sound in game turned up to max and everything else turned down and I can still barely hear her.
I don't have this problem with any other champion, only with Zoe.