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The mono problem is on every single Wii version of GH3. By changing the Wii setting to stereo, all it does is send the same audio signal to both left and right channels, that's still mono. 

And to clear up some misconceptions, the Wii does output discrete surround sound by encoding sound into Pro Logic 2. A Pro Logic 2 compatible receiver can take the left and right audio signals that's been encoded and seperate out the surround information. It just isn't a digital solution like Dolby Digital.