I am out of luck with programming the Roamio remote to my Vizio soundbar, so I decided to email tivo an they sent me this:
Thank you for contacting TiVo Customer Support. I apologize for the troubles you've had with programming your remote. I would be more than happy to help you with this!
Unfortunately if you were unable to program the remote using the codes listed as well as the code search, there would not be an option to use the TiVo Remote to control your soundbar.
We do hope to release a learning remote for the Roamio models, but at this time do not have an estimation as to when this would be available. You can use the Premiere remotes with the Roamio if you would like access to a learning remote now. The Glo Remote is compatible, but would not offer RF compatibility as the standard Roamio remote does. The Glo Remote can be found here: https://www.tivo.com/shop/accessories#remote-controls