1. A method comprising: identifying a first text-to-speech voice unit in a first database, wherein the first text-to-speech voice unit has an emotional context from a first speaker; identifying a second text-to-speech voice unit in a second database, wherein the second text-to-speech voice unit has the emotional context from a second speaker; storing the first text-to-speech voice unit and the second text-to-speech voice unit in a combined database, to yield combined voice units, as if the combined voice units were from a single speaker; and synthesizing speech using the combined database.