I am using a mix of existing components (so no manuals to be found) to put together a system in a large conference room at my work. The receiver is a Sony and I am have got everything hooked up, but I cannot seem set up all channel music. Can anyone help me out here? The receiver is set up for surround sound but just will not play music out the two surrounds. The model of receiver is STR-DE485. Any help would be appreicated.