Trying to set up an Auvio 1pm 4 out composite video amplifier lost the instructions. Shouldn't one set c Of composite cables run from the TV to the one "input side" of the amp. Then the other 3 devices, (Wii, cable ? Box, and DVD player attach to 3 of the 4 "output ports" on the amp??? I get no picture when I select through the first 3 input settings on the TV??