your post is unclear about this, but are you using an S-Video cable and RCA audio cables? S-Video is just that, video. not audio. To get audio, you still have to use traditional RCA (red/white) jacks. if you are using S-Video and RCA audio, and there's still no audio, then that's weird. check the settings on both cameras and make sure you don't have to change something in the output (or input)