Language is English, closest to American dialect I believe, although neither of the speakers are native Americans. Both males and females were trying to test this feature. All of the speakers have adult sounding voices. Also, for the testing I have been trying to use say(1) program on Mac OS X and been getting the same kind of problems.
We have been testing the application on iPhone 3GS, 4th gen iPod Touch and iPhone 4. In all cases, internal microphone of a device was used, there were no external microphones. OpenEars version is the latest one, 1.2.2. None of the audio-related iOS APIs were used in the code we have written since speech recognition is the only audio-related feature that is available in the application.
It seems that most of the phrases in my language model is found in the pre-packaged cmua07.dic file, but there are exceptions.