Navigation Volume - 04 S500



I have a 2004 S500 and I'm also as deaf as a post.
When I use the Nav, I can hardly hear the voice. I have turned the nav volume all the way up in the settings but its still not great. Is there any hidden settings that would allow me to turn up the nav volume even more? Also, is it possible to put a British voice on there too?Thanks in advance.

My car speaks "British", actually German and some other languages too but this probably isn't an option on the US map DVD.



