No audio on new MBP 13'' with Windows 7 - new hardware?

I have a brand new Macbook Pro 13" (Alu Unibody) where I installed Windows 7 RC using Bootcamp v2.1. This basically worked great and most of the hardware components were identified automatically by Windows (just iSight needed a manual installation from the Leopard DVD). So everything is working perfectly apart from one thing: I don't get the sound working! According to the hardware manager a "High Definition Audio Device" is installed correctly and also working fine as the meters are jumping up and down when I play music - but I just don't HEAR anything! I just see that glowing red light in the headphones plug hole...
To prevent some generic answers: yes, I tried to install manually the well-known Realtek drivers, but obviously the hardware has changed since for the latest MBP as the sound device doesn't work with that manufacturer any more (code 10, cannot start device). And there are no driver updates and no bootcamp / Apple updates available. Also the volume levels are all set to maximum, the speakers are set to be used for output. And I also tried x86 and x64 versions of Win7, it's the same for both. So I don't know what to do now... can anyone please help? Does anyone know what soundchip they use and what driver to take? Thanks in advance...

I just found the answer myself: the hardware indeed changed compared to the older Macbook Pros and now features a Cirrus Logic CS4206A High Definition Sound Chip instead of the RealTek thing. After installing the respective drivers from the bootcamp folder (Drivers/Cirrus/CirrusAudioVista64) everything works now perfectly!

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