Are there any American voices besides Samantha that can be downloaded that are TTS capable? I'm referring to voices that can give full street names, etc., such as the default Samantha does. Thanks.
Yes. Use Garmin Express, go to Tools > Utilities tab > Optional Updates > Language Files > English. That will give you all the available voice files, TTS and non-TTS. There are several TTS voices you will get with that download.