Chale,

I have exactly the same problem you had(?). Like you, Google Maps voice works fine, but nothing on IGO Primo. My CPU-Z is identical to yours (android 8.1, API level 23, etc.). And, based on your first post, I believe we may have the same device -- or an equivalent Chinese version including pre-loaded iGO Primo 9.6.29.3889. I have tried all the same work arounds -- changed navigation_audio_stream from ; to no ;, used 0 - 5, installed Vocalizer and VocalizerEx. Nothing has worked. Could you tell me which sys.txt you have ended up with and if you are using Vocalizer or have switched back to standard Google Voice? I have also searched these forums as well as the rest of the internet and cannot find a solution. You are the first one that seems to have made it work. Any help you could give me would be greatly appreciated. Thank You.