I have sent plenty of sound cards to external dacs thru optical for years. As long you config the sound card's Virtual headphone up correctly as in setting windows and games to 5.1 with the Sound card panel to headphones. Dolby Headphone,CMSS3D and SBX surround will work very well. Just remember to unselected Full range in the check boxes when you setting the speakers to 5.1 in windows sound options in control panel so they will work correctly.
Thanks for the reply.
And uh.. since the datais being sent to the Modi2U, the real processing of the sound will be made from it , correct ?
So I'm bypassing the PCIe card, which leads to not necessarily buy the best soundcard in market but one with the desired 'effects' w/o losing much SQ.... right ?