My motherboard is asus h61m-a, which has an on-board sound card realtek alc 887. I have a 5.1 home theater hooked up with it. In realtek software under the Room Correction tab, I can't correct my individual speakers. Room correction only affects front left and front right speakers. My speaker configuration in realtek and windows speaker settings are set on 5.1. I even notice that if I mute volumes for rear and center speakers in window speaker settings, there's no effect on them, I still get sounds from them. Both Mute and Balance options only affect the front left and right speakers. Your help would be appreciated.