You won't find a code with volume commands preset for the Roku soundbars. All the roku soundbars use the same IR code that roku 12 years ago used, but with a few new added commands for tv power, volume up & down and mute. These are strictly Roku commands, not tv or any audio commands. UEI made remotes with roku code 03061 on board, that accepts advanced codes or efc's can have those commands added individual by entering 5 digit code for power, 5 digit code for volume up and so forth. Saying all that you DON"T need a roku code with those commands, all you need a is a code for your tv!!
If you have it set up right, using hdmi-arc, the hdmi-cec which is what those roku soundbar tv commands are, with hdmi-cec turned on, the roku volume controls the tv, and tv volume controls the roku soundbar. So program the cable remote with your tv brand make sure the tv volume is punched through to all devices, it will control your roku soundbar pro.
Edmund
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