Great for X-Fi sound card

At first it did not work and I tampered into the jack of my sound card with a wooden toothpick and there it worked a bit 48Khz max, then I made a phone small paintbrush in jack my sound card and I took out a packet of dust and it worked much better with 96Khz passing.

So if it does not work for you, cleaning the inside of the optical jack of your sound card, it must emit a strong light red LED (at the bottom of the jack).
If the jack does not emit light that is whether it is not optical (Therefore this accessory you no good), or is that the optical output is not activated in the parameters your sound card.