This motherboard has this many capable channels in the motherboard's integrated sound. If the 3.5mm jacks can provide the connections, what about the grey colored jack for side speakers? The picture only shows green, orange/gold, and black  (front, center+sub, and rear) respectively. Only other jacks are the mic-in and line-in. So how is it possible for this Mobo to achieve a 7.1 surround speaker setup besides onboard HDMI or video card connections to an a/v receiver box?