RB3

http://customscreators.com/index.php?/topic/11866-emulate-pro-keyspro-guitarbass-on-dolphin/page-3

http://customscreators.com/index.php?/topic/14630-how-to-playing-customs-on-wii/

http://customscreators.com/index.php?/topic/14630-how-to-playing-customs-on-wii/page-113

http://customscreators.com/index.php?/topic/11866-emulate-pro-keyspro-guitarbass-on-dolphin/

https://forums.dolphin-emu.org/Thread-plugged-in-wii-usb-support?page=2

https://wiki.dolphin-emu.org/index.php?title=How_to_use_the_Official_GameCube_Controller_Adapter_for_Wii_U_in_Dolphin#Windows

https://www.fretsonfire.org/forums/viewtopic.php?f=34&t=46788