Audio for German umlauts:
http://www.youtube.com/watch?v=XTzZn6j0A4Y
Laconic: an umlaut marks a change in the sound of the original letter.
I don't speak German, though -- maybe a speaker here would like to go into detail?
Another video:
http://www.youtube.com/watch?v=uIbVxr6YgB0This message was edited 6/24/2011, 11:27 AM