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In addition to the viewer installer, you must download and install additional software to enable voice functionality, as well as to enable some graphics features. Someone more involved in developing the viewers would be more qualified to explain why, and what gets installed. But the additional files to download and install are: For Windows: http://greenlifeemeraldviewer.googlecode.com/files/Emerald_Viewer_1.23.5.x.Windows.Voice.exe For Mac: http://greenlifeemeraldviewer.googlecode.com/files/VoicePatchEmerald.dmg