Yes, that's right, what Kalle says.
I think SVOX can only use TTS in german, because it's the only installed and availlable language for
SVOX (you have to install the additional languages separately).
I you use google TTS (oder Samsung TTS in Samsung Phones), there are several languages available
but VoxWav is ALWAYS setting the TTS language to Englisch.
I think you have to use in VoxWax the selected language of the phone.
There must be a variable that needs to be read then, or something.
I'm sure you will find the problem!
Siutsch.