How to Improve Accessibility of Orca Screen Reader in Ubuntu 12.04?

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http://askubuntu.com – I am a visually impaired computer users and would like to switch to Ubuntu 12.04 from Windows 7. However, i noticed that Orca isn't always accessible when using some programmes like Audacity. Sometimes, Orca says 'inaccessible' when i launch certain programmes. What can I do to improve the accessibility of Orca? Any help would be appreciated! (HowTos)