Every now and then we receive a post 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 ...