So in the first episode where we meet "The Voice" the end credits of the show never reveal who the actor was playing the character we never see. I under stand that, for obvious reasons the show creators would want that to remain a mystery. Except by the time they got to the episode "Sotto Voce" they didn't use the same actor. In fact a line of dialogue that Harold uses pulls double-duty when he talks about Easton using a voice modulator. This explains why he sounds different in person than on the phone in Last Call, but it also covers the fact the voices are different actors. I'm wondering after all this time if that will ever get revealed. :-)