Faustling

I wanted to play POE2 in German. My login on Steam is German. The "Properties" for the game said the language was German, but as soon as I started to play, I got nothing but English. Googling through the net, I found I could go into regedit change LanguageName (HKEY_CURRENT_USER/Software/Obsidian Entertainment/Pillars of Eternity II) to German, and that gave me German text, but the sounds are all still in English. Is there any way the change the audio too?