It is sourced through the VGA cable and the USB is attached. However, the option to select the sound output via USB doesn’t show up in Devices under Control Panel so I can’t get it to go through the USB. The board works fine otherwise.
When using a VGA cable, you will need to use an audio cable in order to use the sound.
If you have a HDMI cable, as this is a digital input this will carry the sound also so a audio cable would not be required.