I have a TiVo glo remote and a TiVo slide remote and I'm trying to get them to work with my Vizio VHT510 sound bar. I've used the learning mode to program the volume and mute buttons. The programming appears to work but when pushing the buttons on the TiVo remote the sound bar doesn't reliably recognize the buttons. Mute works pretty reliably. Volume up works sometimes. Volume down doesn't work at all. It doesn't matter how close or far the remote is from the sound bar. Both TiVo remotes show the same behavior. Yes, the batteries are fresh. Any idea why this isn't working well?