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== Recalibrate the Controller ==

Recalibrate the Controller in one of the following ways:
* Push RESET (or turn the system OFF and then ON) while making sure to not touch the control stick. This ensures the control stick is in the Neutral (center) position.
* Press the X, Y, and Start/Pause buttons simultaneously for three seconds during game play, making sure to not touch the control stick. This ensures the control stick is in the Neutral (center) position.
* Unplug the controller and re-insert it (while the system is ON).

Source: [http://www.nintendo.com/consumer/systems/nintendogamecube/trouble_accessory.jsp | Nintendo - Customer Service | Nintendo GameCube - Accessories]