Optical audio but Analogue output

Hi, I connected my AppleTV to my Bose audio system ONLY with optical audio cable.
I figured out that sounds comes out with a movie in DD and ALSO with other sources (like youtube videos).
The Audio & Video settings on ATV is setup to ON regarding DD.
Question: I thought that with that configuration I could hear only DD audio stream. Is a BOSE features or ATV output audio through optical always regardless its source format ?
Thanks, Roberto.

Oh yes, this is the reply I was looking for, so in this case I could avoid using the analogue output (RCA) on ATV ? In the case I'm going to use it anyway which will be the channel used by ATV for outputting audio ?
Question: if I have a movie with two audio tracks (the first one stereo and the the second one in DD) and connect the ATV to my Bose audio system with optical audio cable and my ATV is setup with Dolby Digital on which will be the audio stream passed to my Bose audio system ?
Thanks, Roberto.

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    Message was edited by: Alley_Cat

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