First that you for your reply. I am sorry to hear that this can't be done, I was really hopping to be able to do this with all optical. You mentioned that it needed to be electrical to be controlled, Does this mean I can use the other input present on the card. If so, is that why you gave me the link to the DAC info? I was wondering if they controlled the same. If so can you provide me with the pins I would need to connect to in order for this to be connected to a control knob.