Aha...that's it.
Solved, thanx !

Hoi vuurvlinder.
I added your voice file from post # 5 to the dir " voice "
Tested it on my tablet, select it in settings, tab on it, worked great.

Did the same in my car headunit....quiet, no sound.
There is also the Dutch voice file of kajoe : workes well.
I uninstalled iGO and installed again ( in the car ) and....your voice work fine but the next day there is no sound again.
I have to switch to the kajoe voice again.

Strange is that on the tablet there is no problem at all, next day after reboot your voice is fine.

Both exact the same configuration.
Any idea ?