raphnet Classic Controller / Wii Guitar to USB adapter - V3 | eBay
After three long months, my raphnet adapter finally arrived! : r/Gamecube
DIY Raphnet adapter for $5 : r/CloneHero
The Raphnet Wii Classic Controller to USB is the real del. It's seriously as good as a Wired Xbox 360 guitar. Legitimately buy one of these if you have a Wii Guitar.
raphnet. - Classic controller to USB adapter - V3
raphnet. - Dual Gamecube controller to USB adapter