Dolby Digital Live was introduced with the Intel 915 chipset and support continues with today's modern motherboard chipset. It requires a single digital (S/PDIF) connection. It s a purely digital scheme, as opposed to analog, that game developers use in there game code to deliver audio discretely to each individual channel (R L C RR RL & LFE). It (DDL) is not a matrix surround (software/analog) commonly found on usb headsets with only two speaker drives to emulate the same sounds. In order to use DDL your headphones would need 6 speaker drivers (3 each ear) and discrete inputs for each of these channels coupled with a sound card that has discrete outputs for the same. In order to be able to use the DDL features of the ALC889 you would have to use the S/PDIF out which will enable the feature through your control panel and connect that to a HT Receiver that can decode DDL. I hope this brief explanation helps.

Because the headset is not a digital connection every time thety are plugged in they will be the default Audio output.  There will be no options for digital or control thereof in your Sound control panel while in use. If you were to unplug the headset and make the S/PDIF connection to a Home Theater receiver or a speakers system like the Logitech Z5500 or other with digital input then you will see the controls you are looking for from the Windows Sound Control Panel.