I like the ICS navigation voice a lot. Much better than on GB. But if I go into settings and test out the Google TTS the sample for English (United States) is different from the navigation voice. As is the British English, which is guy talking. But if I set either of these, the navigation still uses a different voice. However, I also have IVONA installed and if I set one of those as the default, the navigation then uses that voice. As I expect. How do I set the navigation to use the Google TTS engine?