Not 100% sure what you are saying, does your sound bar have a separate volume control that is controllable with a remote or is it controlled by the TV's volume control? In any event your TiVo's remote can only control the volume on one device. I use mine to control the volume on my Onkyo receiver without issues.I have a Tivo Prem and have it set to my Samsung UN55D8000 and Samsung Sound bar HW-D450. The remote runs the TV well but I can not get the volume on the soundbar to work. I tried all the codes I could find but nothing. Should they all work together?