I don't hear the speech ingame and in the intro. It is noisy and the volume is too low.

Also I would like to have the German localisation as it features the (German) voice of Bruce Willis for the main character. Is this possible?

http://www.gog.com/en/forum/outcast/german_language

Maybe the music-patch is needed too
(Ich musste den Musikpatch auch aufspielen nach der Sprachumstellung, gibt einen Thread dazu, einfach mal die letzten Posts hier durchgehen).