I'm sure this will be a simple question for a lot of you. On a AV receiver, can we hook up more than 1 video source on the same input label? For example, I connect a LD player on the composite video input labeled "DVD" and I connect a cable box via S-Video on the S-Video input also labeled "DVD". Will this work? Because if it does it makes a difference on the number of A/V sources you can hook up at the same time. Thanks in advance.