Hi,
I can definitely confirm that our voices work perfectly on The OpenSuse AMI that Amazon provides. I would assume that everything is the same on other AMIs as well. If you are not aware, we provide fully functional software for download on our web site here:
http://www.cepstral.com/downloads/so that you can always confirm that our software works on your system before purchasing a license key. If you would like me to test on a specific Amazon AMI I would be happy to do that for you. Micros are so cheap these days....