Thanks...
So if we take my example then when I have the following devices:-
Bluray
Mediaplayer
Sky
Squeezebox
So wire these up as follows:-
Bluray --> Amp --> TV
Mediaplayer --> Amp --> TV
Sky --> Optical Amp (as I'd rarely use the amp for it).
Squeezebox --> Optical Amp (music FLAC playback etc).
So if I wanted to watch a film on the bluray/media player, I assume I'd turn that device on, and the amp, and the TV would autoswitch to the amp's HDMI input?
Done...
My current setup is using an old amp where everything is sending audio to the amp via optical etc, which is a right pain at times. Infact it means I'm having to buy mediaplayers with optical out. Hence me looking to replace my amp and go with a more traditional HDMI image/audio through the amp approach.
I've got an old Yamahe V461 which really doesn't even do HDMI pass through, so everything I have does optical (or the like) into it and HDMI into the TV.
I want to look into replacing this with something like a Onkyo NR646 to means I can wire up more "traditionally", and hopefully improve the surround/music quality too.
Understanding ARC only does TV --> Amp, and not device --> TV --> Amp helps!