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Click on HDMI > Output and make sure

The Source is Focusrite Thunderbolt

click on Configure Speakers

Make sure they are set to 5.1 Surround

Apply > Done

When you get trough the prompts

Open a New Project or Existing Project

Find the 2K clip with the 5.1 interleaved audio that was exported

Right click it and choose "Add into Media Pool"

Choose to Change the frame rate

Click "Change"

Right click in the Media Pool area

>Choose >Timeline>CreateNew Timeline

Set the Timeline to be 1 Video Track

1 audio track that is 5.1

Uncheck Empty Timeline

Click on "Create"

>Davinci Resolve

>Preferences

Assign Video and Audio I/O to UltraStudio 4K

Audio Interface set to Fairlight Audio Interface and MADI

you must close project and quit Resolve before

you can setup speaker setup

Speaker Setup

Manual

MAIN

Focusrite Thunderbolt

Monitor Set Format 5.1

Assign every channel output to the Focusrite Thunderbolt

left = 1 Focusrite Thunderbolt

right = 2 Focusrite Thunderbolt

center = 3 Focusrite Thunderbolt

LFE = 4 Focusrite Thunderbolt

Ls = 5 Focusrite Thunderbolt

Rs = 6 Focusrite Thunderbolt

You will have to close and Re-Open Resolve -

Save Project and exit

Choose Format 5.1

Click on OK

That should be it and can hear surround as expected:

Next steps are not needed but good to know that these settings exist

Next choose the Fairlight tab at the

bottom of the application to enter the Fairlight mode

In the Fairlight mode click on Fairlight>Patch Input/Output

>Patching Interface opens

On Source Choose Main Out

This is how the Patch Input/Output should look

Next select source channels L, R, C, Lfe, Ls, Rs in this order by clicking on the channels

Then on Destination click on channels 1-6 in order

They will have a white border around the boxes like this

Then click on Patch

Now you see the patches are correct

for 5.1 monitoring

close the window

Now play the timeline

you will see the 6 channels playing back

like this and hear the audio in the appropriate speakers