I am trying to connect my computer to my stereo so I can play music over my external speakers. I am outputting from the computer with the following setup. Out from the computer with micro cord plugged into green outlet to a RCA splitter and then the RCA cables to my receiver. I get lond sound from my left front speaker but much less sound from the other four speakers. My realtek sound card came with the computer but I have downloaded latest drivers. What am I doing wrong? Is there a solution? Any help greatly appreciated.