My motherboard supports 5.1 and 7.1 surround. http/uk.gigabyte.com/Motherboard/GA-H97-D3H-rev-10#ov. That is my motherboard. Why then does my surround setup not play through all the speakers. The two sides do not play sound (or very very low). What am I doing wrong? I do not have dedicated sub port but am using the line in etc.