How do I connect my new Apple TV to an Onkyo receiver so I can play music on zone 2?

I have an Onkyo TX-NR515 A/V receiver attached to an Apple TV 3rd generation. The receiver only accepts an analogue feed into its zone 2 speakers, to solve that I hooked ATV’s HDMI outgoing connection to zone 1/home theatre and the outgoing optical connection into a digital to analogue converter which I connected to the TV/CD input which became the ATV feed source for zone 2. I have lately bought the new apple TV, while connecting it, to my horror, I discovered that it only has one outlet, meaning that I don’t have a second feed to turn into analogue and connect to the zone 2. Any ideas about how I can solve this without turning both zones into analogue or having to buy a new receiver? So far the only feasible option I can think of is keeping my old Apple TV, give away the new one and berating both Onkyo and Apple for it.