There are three audio jacks on motherboard. The blue jack is for stereo line-in signal, the green
jack is for stereo line-out signal, the pink jack is for microphone. The 5.1 channels audio output at
least needs three jacks output: Front speaker output, Rear speaker output, Center/Subwoofer speaker output. Please select “6CH Speaker” item under “Sound Management” interface like the picture below. The blue jack is for Rear speaker output, the green jack is for Front speaker output, the pink jack is for Certer/Subwoofer speaker output. Then use the audio jacks to connect correlative audio devices.