I have my music on usb and sd devices to play in my car. With the ROKU soundbar and speaker system I would like to be able to play my music on the ROKU speaker system. Since the Roku is on a HDMI 1 or 2 etc I don't believe I can use the USB input on my TV and play the music on the Roku speakers. And it would probably need some kind of channel access just to play music and not TV. If your spending all that money on a speaker system let's figure out how to put it to good use.
.....unless the ROKU could crossover to where my music device is. I think it would be easier to add an additional input to play MY music directly through the Roku speaker system.