Charcoal 1. The GameCube had four controller ports, no need for multi-tap or anything. The adapter was made for Wii U, which featured zero GameCube controller ports. Simply starting a GameCube game with four controllers configured will make it use them as appropriate.
The PS2 features a “multi-tap” option as the console originally only had two controller ports, so for four player games the game itself needed to “see” the multi-tap adapter. That is why this is an option in EmulationStation.
- In this case, you would connect your multi-tap controller, and then configure each connected controller as player 1, player 2, etc. in EmulationStation. There should be four controller icons appearing in the top left corner when you’re done. EmulationStation will automatically configure the controls for you when you launch the emulator.