Every now and then we receive a post [question] about how to modify the audio navigation. I did it today on my 2.4 after a lot of misses. I ran a simulated trip using my modification and all was well. Here's how I did it.

1. I created a new folder on my computer called "voice".
2. I copied/pasted the voice I was using from content\voice to that new folder.
3. Inside the unzipped voice from content\voice is a folder called "config".
4. Opened up config folder and found "config_transform_tables.lua".
5. Copied/pasted that file to the new voice folder.
6. Opened up that file using Notepad. But Notepad wouldn't let me make the changes and update the file.
7. Years ago, I made verbal changes to iGO8 that were made using "Textpad" because Notepad didn't work. Thus the link to version 5 of Textpad.
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8. Using Textpad, I made the necessary modifications. Save the file.
9. In the new voice folder, I unzipped the voice from content\voice to config_transform_tables.lua and deleted that file.
10. Copied\pasted the modified config_transform_tables.lua file back to the zipped voice from content\voice.
11. Went back to the program and deleted the voice from content\voice.
12. Copied/pasted the modified voice from the new voice folder to content\voice.

WORD OF ADVICE! MAKE A BACKUP OF THE VOICE YOU'RE CHANGING FIRST - JUST IN CASE. Here's a copy of the config_transform_tables.lua that I modified. The first 13 are what I modified. Notice that they are at the beginning of the file. It seems that any other place breaks the format and no more TTS.
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I made a few changes to the config file. Suggest that you download the new.