Are you sure the port is digital INPUT,
and not by chance OUTPUT?
Yes. There are 2 jacks and I am using the digital out to my sound system which works just fine as long as all the sound sources are integrated into the PC (system sounds, CD, DVD, music programs, etc.) The Korg synth module is the only off board music source I am using. I updated the Realtek driver today and now I do get some soft static sound out of the module when I play it via my midi keyboard so it is inputting something but the PC audio is not doing the job like it should.