I think its kind of funny that everone want and extremely comlicated solution here......

If your NOT using a Satellite box or Cable box, then I would guess that your cable TV is going stright into your TV's RF Input. TV Speakers should be set to ON, and you will have standard TV Speakers with Volume control when your on your Cable TV input.

FOr your DVD and VCR, just run the audio to the Receiver and Video only to the TV. So when your on Video 1,2,3,4,5,6,7,8,8645 there is no audio going to the tv.... no audio = No sound fromt he TV speakers. Use the receiver remote for volume then.....

Unless I missed something else... That seems to be the easiest solution in this scenario.