This discussion is very interesting to me as I'd like to use one ATV as both an audio and a video source (at separate times). In these forums, I've posed the question before as to whether or not it would be possible to do so and not have the LCD panel ever turn on (i.e. not have to hit the Picture Mute button as Affineur suggests). I've been told it's possible here on the forum, but I've had dealers dispute this. Here's the thread where I asked the question:
http://forum.beoworld.org/forums/t/30729.aspx
I've also wondered if the same ATV could have some of it's outputs go to an audio source whilst still having video (via an HDMI) go to a video source. I'm led to believe that you could connect an audio source (via Toslink or RCA) to the ATV for audio and still have it connected to a video source via HDMI. Does anyone here think otherwise regarding the ATV's ability to simultaneously have two connected output sources?
Mark
P.S. I haven't been able to tests these hypotheses as I don't currently have a BV-7, and my lowly BV-8 is broken.