The voices CrazyTalk has are the ones that are currently installed on your system; it doesn't come with its own voices. On the PC that would be the Microsoft voices, I don't know about the Mac.
One option is to buy and install additional voices, but that's expensive (maybe $50 for a voice) and there are often usage restrictions.
RL has a text-to-speech on demand service:
http://tts.reallusion.com/. The advantage is that you have a choice of many different voices and languages and pay for what you need.
An even cheaper option is the new
https://aws.amazon.com/polly/. The first year is free at 5 million characters per month, after that it is $4.00 for a million characters. That should suffice...:P