In a class in which you want to use FliteController you need to import FliteController.h:
#import "FliteController.h"
Next, you need to open OpenEarsVoiceConfig.h in a correctly-configured installation and uncomment the voices you need to use, as explained in that file.
Then you can instantiate FliteController and send it the following message using a voice you've uncommented:
[self.fliteController say:@"A phrase I'd like my app to speak out loud." withVoice:@"cmu_us_awb8k"];
That should be sufficient if you're clear on how to instantiate the object and your installation of OpenEars is correct. If not, there is even more detail on the specifics at the following URL:
http://www.politepix.com/openears/yourapp/
open ears
. Nevermind. – Hamish