I just started the vox trial. I can hear the voice microsoft anna. However, I have added two voxpop voices which show in the vox config window. I am able to select those voices, but when I click the speak button I do not hear the sample of the voice the way I do with Anna. Also when I launch fsx I can only hear anna has my flight officer but I can not hear any of the other voices. I am running fsx on win 7. I also have the voxpop server control up and running. 

Just an update. I was able to hear the voices once I turned off the voxpop server.