Goodness. I had the same problems, but mine only howled when I was home...I think...I don't have any neighbors close enough to tell me if he was howling when I was gone.
Do you leave something to occupy him while he's in his crate? Maybe a Kong or something? For me, I just had to put up with it until Gabe eventually stopped. And he STILL will cry/howl on rare occasions. He did this morning, in fact...
I wish I had more encouraging input...
Kiera: Brangus Heifer: 1/15/2006 -
Jacky: Black DSH: 05/2008 -
Gorbachev: White DSH: 06/2010 -
Peanut Butter/"Snakey": Red Corn Snake: ???
Gable: Black and Red GSD: 03/02/2012 -
Jarah: Red Betta: 05/2011 -04/30/2013