I have a Roamio OTA. I receive my programs via a TV antenna. I recently purchased a Samsung Q6F 4K TV and a Samsung HW-M460 sound bar. I have the Roamio connected to the TV with an HDMI cable and the sound bar connected to the TV with the sound bar supplied digital optical cable. The sound bar works great and I get very good audio for the HD (1080i/720p) stations. The sound bar audio settings for these are typically 10 or 11. For the SD (480i) stations, the volume needs to be raised to 17 or 18 to get the same listening level. The Tivo is set to dolby digital and the TV is set to default to the sound bar for audio. Is there any adjustment I can make on the Tivo to get the SD stations at the same audio level as the HD stations?