In season 1 you could tell it was Audrey by episode 1, since that was literally her voice on the phone luring her girlfriend into getting killed. It's not like you can just buy a voice changer and make it sound exactly like your friend Audrey. Thats just impossible.
Now its obviously Emma is the killer since everytime someone dies, or gets kidnapped, is when she has a dream or mental psychosis about the killer. Like when she first dreamt about the old barn, was when Jake was also being brought to the barn by the killer. #Scream
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The killer also call Emma as Will's voice in season 1
BurninKu5h but when Emma asked him where did they go for their first date the second time he suddenly forgot, that's why i think that the Piper got a voice changer similar to Roman from Scream 3
TykerV I barely like the show, so I dont remember every conversation. But you do realise it is impossible to go out and buy a voice changer and have it set to be your friend Audrey's voice, or Will or whoever. I haven't seen Scream 3, but i know in the other movies, the voice changer is just a random guy's voice. Not actually taking another character's voice, that is just science fiction, and if that is what you are telling me happened than this show just got a whole lot shittier.