Im in the middle of setting up my first speaker system and am slightly confused on how to connect audio. To get multi-channel though my DVD player do I need an digital optical cable? And my GameCube doesnt have the digital audio out but if I connect it to my reciever using its normal stereo audio cables will it play surround at all? And if it will what do I need to do to make sure it does? Also, do I only need to connect my sub using the LFE connection?