Hi David,
You have selected the Dell USB Audio as default output, that's how to do this.
The Dell D3100 routes the sound to multiple outputs simultaneously so, unlike the dedicated graphics card sound adapter, it won't take the name of your amplifier as it can't take multiple names. It would be a bit overwhelming to get 5 new audio devices (2 HDMI, 1 DP, 2 jacks) just for the dock anyway...
If you don't get any sound on the Sony receiver, can you try removing the jack to see if that enables it?
I'm not sure how Dell implemented the audio on their dock.
Kind regards,
Alban
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