I think it depends if your devices are smart enough to communicate with each other.
My Samsung TV, Samsung BR, PS3, are all connected to my ONKYO 709.
When I turn on my Amp with TV on already, Amp will switch to TV automatically.
When I insert BR, TV will switch to HDMI and Amp will switch to BR
When I change volume using TV remote, the Amp will change volume too.
But when I turn on my PS3, my TV and Amp will not do anything
When I turn off TV, it will turn off the Amp and BR at the same ti
me, but not PS3