Based on your previous posts, I am guessing this is the 6th Generation iPod Touch. My guess is you are using the headphone jack to connect it to the AV Receiver.
You will have to turn up the volume on the iPod Touch when using that cable to get it loud enough for the receiver to detect it. Usually 80-95% is loud enough. The AV Receiver volume may have to be increased as well.
I don't have an adapter. And I can't use my docking station either because they changed the jack on the newer models. I've decided to send it back for a refund. I will stick with either my CD player or my 4th generation iPod.