As I see it, the USB connection alone is not enough. You also need the optical connection, or if not available on the PC, the line-out/headphone connection, which you then connect to the AUX connection. But there are also USB to optical out converters. In order to have full functionality, it is also necessary that the built-in sound card supports Dolby Digital technology. In the manual there is a PC connection configuration, there you can see the possibilities. However, it is in English...
https://static.digitecgalaxus.ch/Files...
Hope it helps
