This may be a dumb question, but since its my first here, please forgive me. I'd like to know if its possible to use two video sources for the same input. Here's my scenerio. I have an S-video cable coming from reciever to the TV. Underneath, on the same "Video 3" input is a composite input and stereo inputs that are unused. Can I connect a composite cable from the reciever to that composite input as well even though there is an S-video going to the same "video 3"? There is another composite input on the TV, but I use to directly connect a Direct Tv reciever so that I can use PIP. There was nothing in the manual telling me not do so. Any insight would be appreciated. Thanks.