I have two pairs of computer speakers that are set up in a quadraphonic configuration, and it works fine for quadraphonic media like games. I need a way to make stereo media play on all four speakers, like YouTube and music I have downloaded. I know the surround speakers will be playing the same audio as the fronts, and I'm fine with that, i just want my music and videos to sound better. I have Windows Vista and the Realtek HD Audio Manager, and my inbuilt sound card.