I have realtek audio HD sound built into my motherboard. When I try and play music or movies through itunes or windows media player the sound only comes out of my front 2 speakers. I'm using 2 front and 2 rear speakers with a subwoofer currently and have it set up through the realtek audio manager that way. When I test it through that program the sound comes out of all 4 speakers perfectly. How do I get itunes and wmp to play sound through all 4 speakers even if it's only 2 channel audio? I appreciate any responses, thank you