Hi I'm trying to setup 5.1 surround sound for my computer using my Logitechz903 using the digital connection.. up until now iv been using normal audio connection for it and it works but only if I disable the effects on the unit.ie 3d sound,4.1 etc otherwise sounds are missing from things in games and movies but having it disabled makes the sound very flat. I was told to use a optical connection but I never used this before and im having problems with it. I have connected the optical cable from the Logitechz903 to my ASUS maximus IX formula motherboard. and i have switched the Logitechz903 box to mode 4 (optical) iv run the test on the unit itself and everything is working yet im not getting any sound at all on the computer when trying to test it using the Realtek HD audio manager. If i go into supported formats in windows 10 device properties under sound settings, I am able to test and hear all the sample rates (192.0khz being the highest) but only from the 2 side speakers. Under encoded i have the options that i can tick for DTS Audio, Dolby Digital and Microsoft WMA Pro Audio but the test button is always grayd out and under sound control panel playback Realtek Digital Output has a green tick next to it but I can only click properties. Configure and Set Default are grayed out. what am I doing wrong?