Honestly, the mono sound isn't that big of a deal. You only really notice it during co-op and sometimes during star power (it can also vary depending on what sound setup you have...on surround I don't notice it much). Songs still sound good and the game is quite fun, so don't let it deter you from checking it out.
Also, Rock Band has not been announced for the Wii yet, and even if it ever does come to the system it will likely not be until late 2008 (probably after GH4 comes out).
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Honestly, the mono sound isn't that big of a deal. You only really notice it during co-op and sometimes during star power (it can also vary depending on what sound setup you have...on surround I don't notice it much). Songs still sound good and the game is quite fun, so don't let it deter you from checking it out.
Also, Rock Band has not been announced for the Wii yet, and even if it ever does come to the system it will likely not be until late 2008 (probably after GH4 comes out).