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Mark is correct - you cannot use a digital audio input to output sound from the VIDEO 1 analog outputs (check out page 34 of the Sony owner's manual, and here's a l
ink to the PDF on Sony's site). There are a couple of options that come to mind, assuming that your TV has an analog audio output (which might be a headphone jack):
1. You could also connect the TV to the Sony using an analog connection and then switch to that analog input when you want to also listen to the TV audio through the Kenwood. The downside to that approach is that you'd lose the Dolby Digital surround sound capability on your Sony because the analog connection would just be stereo.
2. You could directly connect the analog output from the TV to the Kenwood, and then switch to that source on the Kenwood when you want to listen to audio from the TV. If you want to keep surround sound in the room with the Sony, that's the way that I'd do it.
I'm assuming that your TV, if it has an analog audio output, will output audio over both the digital and analog outputs simultaneously. If not, that's more of a hassle.
Also, do you get digital cable? If so, your cable box should have a digital audio output, and that would let you get surround sound from cable, too, as opposed to using a stereo analog connection.