I called Neospeech directly to get to the bottom of this. They said that Neospeech voices are only SAPI 5 compliant which is not backward compatible with SAPI 4 and thus they are not available in MS Agent. Is MS Agent an obsolete protocol? If not why isn't brought up to compatibility with SAPI 5? I bought Neospeech because they are outstanding quality voices but now I can't use them in Navivoice? Why do they work with the voices that come from Frodoplayer?