Indeed, it does seem like 0AD is right up your alley My main worry with your audio samples is that they are clearly recorded in an indoor environment, despite the pronunciation of the phrases being perfect in my opinion. The reverberation frequency would need to be professionally EQed out, or phrases re-recorded in a controled environment (recording studio) before we could use them in the game. I'm not saying the voices we have at the moment are perfect, just that you should look into ways of recording clearer audio.