• Of course, but it is compressed into a surround format such as DD or DTS or whatever by the studio and then just sent as a bit stream, on the BluRay or torrent or whatever. No reason for your soundcard to understand them. c.f: A BluRay player not having a DTS decoder but the A/V amp being able to decode it. The BR player just pulls the bits off the audiotrack and sends them straight through the digital I/F. No?

    BTW, I am not an expert just an enthusiastic amateur.

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