WiiToMidi allows you to convert signals from a Nintendo Wii controller to MIDI signals. It is a Cocoa application for Mac OS X and uses the DarwiinRemote WiiRemote framework to decode Wii controller signals. It also supports the Nunchuk controller. davebv on GitHub has started a fork of WiiToMidi with OSC support and other advanced features. If you are adventurous you might want to check it out! C