5.1 Audio via System Audio or ASIO

General
3

That’s what I thought, too! Everything seems to downmix to stereo though. As per the (dated) Wiki from 2018-05-29 System Audio always converts to Stereo https://github.com/CasparCG/help/wiki/Media%3A-Audio#audio-consumers. No matter what config I use, I seem to always get stereo.

  <audio>
    <channel-layouts>
      <channel-layout name="smpte"       type="5.1"         num-channels="6" channel-order="FL FR FC LFE BL BR" />
      <channel-layout name="8ch"         type="8ch"         num-channels="8" />
    </channel-layouts>
  </audio>
  <channels>
    <channel>
      <video-mode>2160p2398</video-mode>
      <channel-layout>smpte</channel-layout>
      <consumers>
        <system-audio>
          <channel-layout>smpte</channel-layout>
        </system-audio>
        <decklink>
          <device>1</device>
          <buffer-depth>4</buffer-depth>
        </decklink>
      </consumers>
    </channel>
  </channels>