This is the best way to use the Gamecube controller with Parsec as it should work automatically when it is set to PC mode.
Official Nintendo Adapter
Requires this driver and a manual SDL mapping (this needs to be done on the client) - the official adapter may also not work if the client has the Dolphin Gamecube Driver installed.
Parsec uses SDL for controller mapping on the client. Your controller might not be recognized by SDL. If you're having issues with the controller mapping beyond the simple steps, you can try to add your controller to Parsec via brute force.
- Click on the advanced settings link in the settings tab of your client computer (changing this on the host settings isn't necessary).
- Create a file called controllers.txt in that folder.
- Use this tool to create an SDL mapping for your controller.
- Copy the SDL mapping from the tool and paste it into the controller.txt file.
- Quit Parsec.
- Relaunch Parsec.