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I don't recall hearing about iG 4 supporting different voices. iG 4 will have an optional TTS (Text-To-Speech) for pronouncing street names, though. I think the voice options will be: 1. WAV (as in the current version, no street names announced), and 2. WAV + TTS (WAV will say a half of the sentence, and TTS will pronounce the street name), and I think there may be option number 3. TTS (the whole sentence in TTS). But don't take my word for it. I'm only going by what I recall reading about the all-in-one unit by Netropa, which is based on the same software.
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