microsoft dolby atmos bitstream out is totally free, but dolby atmos headphone virtualization is usd15 add on, which honestly sound MEH.. at best.. compare to razer own, or any dobly headphone or dts...

i think you got it wrong , using usb dac , will only stuck at 2.0 output no matter what u send , as your dac has no decoding function for lossless or multichannel direct 3d, you need a soundcard with...