My Xbox goes optical into my receiver and then receiver optical to pioneer Dolby base unit,
It's like a mix amp I guess, and then a 3.5mm plug out to my F1's which gives me Dolby through the headphones. Then I have to plug the mic from a separate headset into the Xbox controller. This works now, but going to try the modmic into the controller with a 2.5 male to 3.5 female and see if this works or may have to plug directly to the Xbox 3.5 jack which is not being used. Hope that makes sense.