Sorry for answering in English but I have suggestions:
Use the Parrot Asteroid Smart or Tablet, why:
1) Good sound quality - Parrot high quality DAC out can be connected to Volvo amplifier
2) USB hub is already in the device - 3G modems, hdd - all working
3) Volvo steering wheel buttons can be connected to Parrot via adapter
4) Device is designed for car and is working very well - I have installed the Parrot tablet to my xc60 and it is working very well - much better then previous nexus 7 with different problem. If you need Volvo Lin-bus steering wheel adapter then you can contact me.
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