Got it, there is an AV plug out of the Roku, connected that directly to the back of receiver.
Using the AV single pin plug to a two connector, I guess they are analog standard jack plugs. So no reason to go into the TV first.
Trying to get sound to play through receiver speakers. JVC TV, model LT-40FN97 with the Onkyo receiver, TX-844. The incoming signal is HDMI coming from a ROKU XD2. into the back of the TV.
So I have internet hook up through Roku, streaming services and Pandora only. No cable
I can't get sound...