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Audio settings are platform (M12/M11) and TV/Receiver dependent.  This controls audio format sent out HDMI and does not impact which audio stream is sent to the audio decoder.

  1. "Stereo" : sends all audio as stereo PCM out HDMI, regardless of the TV capabilities, regardless of the incoming audio stream. Audio stream is decoded and down mixed to 2 channels, system pcm (Voice Guidance, etc..) is mixed in , and sent out HDMI.
  2. "Auto-Detect" : If the TV only supports stereo, then same as "Stereo" above
    • If TV supports up to DD/AC3 (and not DD+) , or box is xi5 and older (MS11), then all audio formats are decoded, mixed with pcm (Voice Guidance) and re-encoded to AC3 (this allows 5.1 channel support over HDMI)
    • If TV supports DD+ and xg1v4/xi6 (MS12), then all audio formats are decoded, mixed with pcm, and re-encoded to DD+ (which allows 7.1 channel and Atmos support)
  3. "Expert Mode" : If TV supports the audio stream format directly, then the raw audio bit stream is sent with no decoding or mixing of pcm
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