I have Logitech Z-680 5.1 surround speakers powered by an Intel DX58SO MB, on-board sound processor. When I use the Logitech speaker "test" function, I get sound from all 5 speakers plus the SW in the appropriate order. However, when I test using the Realtech HD Audio Manager, all I get are the two front speakers. I went to YouTube and tried a 5.1 sound test program and I got the two front speakers and SW normally, but when the center speaker was supposed to play, both front speakers played and when the left and right rear speakers were supposed to play the left and right front speakers played instead. I have tried rearranging the plugs into the computer with no luck. I even rolled back the Realtech driver which didn't work either. Since the Logitech test function plays the correct speaker, I must assume that they are all wired correctly. Does anyone have a clue as to what could be causing this? Any suggestions will be appreciated.