How can I steam videos in German audio language?

Hello!

I am new in the world of KODI and now own an Android TV BOX with pre-installed KODI 16. In both the box settings and KODI settings I changed all language and region options to German/ Germany. Aditionally the preferred language i s already changed from original language to German. Still all streamed videos appear to be in English audio language. The only thing appearing in German are the subtitles. If I set up a filter for “ger” or “german language” or if I search in “video genres “-> “languages” -> “german” there is no output from KODI. I believe that I changed all possible settings to German and just don t find the solutîon…
Is it possible to stream videos in other audio languages than English/ in German and if so: how??

Thx for your help