sounds like they are mixing both as separate audio channels, like left audio has voice and then right audio has music so if you tell the receiver to play stereo it will mix both. some channels do that , they broadcast 2 mono channels as left and right on the same audio track (APID). The CS 6000 has a "green" audio/video key that allows you to select left or right or even set CC ON I think. Try that and see if it helps.