Solved! See posts #7 and #8 below for details. Thanks! I just upgraded to a new Bolt OTA from a Premiere. Love it! I programmed the VOX remote (by pressing the TiVo and TV Pwr buttons followed by code 0238) to control my 2017 Sony Smart TV for On/Off, Input, Volume, and Mute functions. Then I programmed that same VOX remote (by pressing the TiVO and Mute buttons followed by code 1005) to control my ~2000 Sony surround receiver for Volume and Mute functions. The result? When I press Volume Up or Volume Down on the TiVo remote, BOTH the TV AND the surround receiver respond. Interestingly, Mute ONLY affects the surround receiver. TV Pwr and Input ONLY affect the TV, as expected. What is desired? My desire is that the TiVo remote controls the TV ONLY when I press the TV Pwr or the Input buttons and controls the surround receiver when I press Volume Up, Volume Down, or Mute. Can this be done? If not, I will probably need to remove the programming for the TV and control it with its own remote. Also, how do I know if I have used the correct codes for my devices? I'm wondering if one of them is using a universal Sony modulation scheme for volume control that his causing my problems. P.S. In case anyone is wondering: No, the TV and surround receiver remotes do not control both devices: The TV ONLY responds to the TV remote and the surround receiver ONLY responds to the remote for the receiver.