This might be a dumb question, but is it possible to sync playback of a Central and an attached Rio (Dell) Receiver?

I've got a Central in my living room and a Receiver on my adjacent patio. Right now either of those is playing since it's quite disturbing hearing both at the same time playing different tracks. On the other hand it's not quite pleasing to hardly hear any music sitting in the living room while there is music playing only on the patio and vice versa.

Cheers,
Peter