I am trying to plug my XBOX 360, Wii, TV, and DVD player into my Sharp Notevision projector. I have all the systems plugged into a Phillips switchboxand can get video out of the projector but I can not get any audio from any system. They are all plugged into switch box using the RCA jacks that came with each system. I am using a S video cable from the switch box to the projector. Can anyone tell me where I went wrong?