Choose a language and voice
GhostReader and GhostReader Plus only speak in languages and voices that are installed in OS X. To install more standard voices in OS X, go to the Dictation & Speech panel of System Preferences, click the Text to Speech tab, and then choose Customize from the System Voice menu (OS X 10.9 Mavericks, it may differ in other OS X versions).
To get high quality, natural sounding voices try Infovox iVox. It offers over a hundred voices in different languages, regional accents and moods, including child, adult, and 'character' voices. All Infovox iVox voices can be tried for 30 days before purchase.
To set up languages and voices in GhostReader Plus, choose Preferences from the GhostReader Plus menu, and then click Languages.