The Wii version of Guitar Hero III had a mono sound issue at launch.
Early Wii copies output the game’s music in mono, despite the packaging advertising Dolby Pro Logic II surround support. Players reported that the songs were not true stereo and that both speakers could receive essentially the same signal. For a rhythm game built around hearing separate musical parts, the defect was especially noticeable.
The issue affected the Wii release rather than the PlayStation 2, PlayStation 3 or Xbox 360 versions. Activision acknowledged the problem and arranged corrected replacement discs for affected customers. The company also offered a refund alternative in connection with the replacement program.
This is often remembered as a general Guitar Hero III audio problem, but it was specifically tied to the initial Wii pressing. Later corrected Wii discs restored proper stereo and surround functionality. The episode also became a notable example of a hardware-specific launch defect in a major music game.