No Orca magnification in Ubuntu 12.04

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http://askubuntu.com – I'm a visually impaired Linux/Ubuntu newbie. I've installed 12.04 from a live CD and have the Orca screen reader running at start up. Speech works fine but there is no magnification. When I open Orca preferences there is no magnification tab. I have tried uninstalling Orca and re-installing if from the Software Centre, but still no magnification. Can anyone tell me how to add magnification to Orca? (HowTos)