Hi vdesign
We checked this dock with latest 10.12 macOS and both analog outputs (3x stereo jacks at the back of the Toshiba docking station) and digital 5.1 via HDMI are working correctly.
You are right that you need to look in Audio Mini Setup. By default docking station is coming as stereo device.
In left pane select your docking station (initially you should see next to the name of docking station (dynadock Audio or similar) 0 ins / 2 outs.
In right pane make sure your docking station is default sound device.
Then change format from 2ch to 6ch.
After this operation you should see for your docking station 0 ins / 6 outs in left pane and much more sliders for other channels in right pane.
This should be all to change. Please, also make sure that you do have good 5.1 audio sample/source.
Let us know if this helps.
Regards,
Adam
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