Hi, I have a set of Zalman Surround sound Headphones that support 5.1 These worked well on my Shuttle but not on this Asus board. I cannot get the volume of the rear speaker up. I have updated the Realtek AC'97 drivers. I have also dropped the front and side channel volume, leaving rear on max then upping the overall volume still not much joy. When playing HL2 I almost have to be facing something to hear stuff. there are 4 ports Rear, Side, Centre and Front. I’m connected to Rear, Centre and front ( the manual mentions this for 6 channel support, side is only for 8 channel ). Windows config is set to 5.1, the realtek app sets to 6 channel. HL2 and CS:S set to 5.1. The headphones have 3 jacks Rear, centre and front. Thoughts ?