In a statement on its website, Red Octane stated: “We have been informed of a possible calibration issue with Guitar Hero II for the Xbox 360’s whammy bar. We believe this may stem from a feature put in place to ensure accurate scoring. Guitar Hero II features a complex control scheme that requires precise calibration between the game and the guitar. We are currently investigating the situation further.”
There are also further online reports of other faults with the controllers, including issues with the guitar’s fret buttons.