After reading the supplied link, now I am paranoid:

In iDrive, I can choose between stereo and surround. I do not see a choice of 7.1 or 9.1. Can someone confirm if they have other choices in the settings. FWIW, I have a US specced car
Thanks
RezF

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08 X5 3.0 Mineral Green/Black Nevada
Active seats, PP, SP, CWP, Premium Sound, Rear Climate Tech. Package, Running Boards, Comfort Access, Auto Tailgate, Head up, Heated Rear, Sat radio, HD radio, iPod
08 Aston Martin Vantage