Hit Box GameCube Adapter - Support Blog
Currently unavailable for sale.
Tested at Hit Box demo booths and Vegas Smash events for over a year.
Developed to improve the tournament experience: better power conversion to prevent disconnects and a "Home" button for quicker menu access (for dealing with those pesky wireless controller users).
Dolphin - Download and install Zadig. Have adapter set to Switch/WiiU mode. 
PC-mode information for Developers:
- GameCube Controller Adapter
- Product ID: 009b
- Vendor ID: 2f24
- Mapping: Same as Mayflash
Over-clocking information: Maximum of 500hz
