How come arranger demos always sound so phase-y, but then you go to the VoiceLive page, and stuff like this pops up http://www.tc-helicon.com/wait-for-itlive-demo-of-voicelive-2/ . Those harmonies sound quite realistic. Maybe you are overusing a 'doubler' effect?
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An arranger is just a tool. What matters is what you build with it..!