Is there a manual online somewhere I can reference for the few questions I have? Specifically: I accidentally discovered the FRZ button recently and realized it also has PIP. I'd like to be able to switch the PIP from one input source to another. I found I can switch the PIP's CNANNEL (which is useless now that the Feds stole our free TV), but I can't figure out how to switch the PIP's INPUT source. (I got the TV free from a friend who upgraded.)