Channel_layout and Decklinks on 2.1


I'm using the latest 2.1 build and was trying to get audio of files I'm playing outputted to different the SDI channels. I've found some posts related to this in the forum like this one:
But the info is for 2.0.x and things don't work as expected.

I created a channel config like this:

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I've created some channel_layout config too:

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      <channel-layout name="16ch"  type="16ch"  num-channels="16" channel-order="1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16" />
But whenever I try to play a file using:

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PLAY 1-1 file CHANNEL_LAYOUT "stereo:3 4"
it always plays on SDI audio-channels 1 and 2.

Anybody here familiar with this and knows how to output audio to SDI channels 3 and 4?