Since the available Yamaha plugin won't control my RX-A3060 and therefore probably won't control a lot of other newer models, I thought you guys might be interested in this approach.
By using the YNCA commands found in the docs linked below, you can use Cynical Network's TCP Out events to send those commands and it's working perfectly with my receiver.
Getting status updates is a little trickier and still a work in progress for me, but it can be done.