Spoiler: Settings Screencap

Obviously this is a must have if you want to use the Wii U GCN adapter at all on your pc. Make sure you follow all the steps correctly on the webpage or it'll most likely install incorrectly.Next, you'll need the 32-bit compatible version of x360ce:After that, you'll need to extract the Rivals of Aether executable file with a program such as WinRAR or 7-Zip. I'd recommend creating a new folder to place all the files in. Afterwards, place the x360ce.exe into the extracted Rivals of Aether files folder. Now you're all ready to get your controllers set up and working.Open the GameCube USB Adapter Driver - v3.2 and press start so your inputs will be recognized. Then, open up the x360ce.exe and allow it to create the files x360ce.ini and xinput1_3.dll upon startup. Afterwards though, it'll find the new devices and try to find setting for all 4 of the controller ports, hit cancel for all of them. You'll get 4 error messages and then all 4 controllers will have red squares next to them and the general tab will be blank, you'll have to enter everything in manually. Before you can do that though, click the Game Controllers button on the bottom left hand corner. You're going to have to calibrate the controllers by clicking properties, switching to the settings tab, then hitting calibrate. Please be aware the ports for my adapter are kinda weird, being organized as such: P4, P1, P2, P3. So just wiggle the control stick back and forth a bit on the Test tab to make sure you are calibrating the correct vJoy Device. After initiating the calibration, it will prompt you to:1. Press any button with the control stick in neutral (I just hit A)2. Move the control stick in circles3. Press any button without R/L pressed in and the C-Stick in neutral (Again just hit A)4. Z Axis = L5. X Rotation = C-Stick Left then Right6. Y Rotation = C-Stick Up then Down7. Z Rotation = R8. Press Finish down belowNow your controller is properly calibrated for use and you can create your general setting on x360ce. Luckily for you I have a screenshot with everything all set up for you, just replicate everything you see here for each controller tab:And there you go, the Wii U GCN adapter will now work with RoA and with 4 players using GC controllers! It is a bit more work having to calibrate the controllers and opening up the drivers program every time you want to play, but it gets the job done. Have fun finally being able to use your Wii U adapter with RoA!