I was finally able to pair the xr15 voice remote with my Samsung HW650 soundbar, I suspect this will work with other makes. It was not obvious since this remote has no Setup button. You go into setup mode by pressing the xFinity button and the mute button simultaneously.
Here are the steps to pairing the remote:
First pair the remote to the cable box and the TV using the onscreen GUI, just follow the instructions on the screen. If you need to factory reset the remote, just press the A and D buttons simultaneously and then enter 981. Now you'll be ready to pair the remote to the cable box and TV using the onscreen tool by pressing the xFinity button.
Now exit the onscreen setup.
... View more