Realtec Sound Set up

I recently had to do a clean reinstall on My system and have been unable to get my sound working as before. Somehow is was able to get it on previous installs but am at a loss this time. I have an Asus p877-V Pro mobo and want engines noise thru the rear speakers (creative 2.0 connected to the rear panel RR/RL port and ATC/Communications thru the front panel via a USB head set. When I test the devices thru the Realtec audio manager all work but I cannot get any sound out of the rear speakers in application even thought selected as default device. The headst does do so if selected as the default. I know its a simple setup issue but I'm at a loss. Any help would be appreciated.