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If I keep my volume at the same level and boot up my original Wii and then my Wii U in Wii mode, the volume isn't any different. I think the sound is just naturally louder for the Wii than the Wii U. It's kinda the same principle that not every game has the same volume output.
PSN: JVir NNID: Jayvir These days, all the kids are playing M rated games while the adults are lining up for Pokemon. Which game is a kid's game now?