To make a Waluigi cover simply upload an audio clip or enter a link from youtube. If this audio has instrumentals open advanced settings and make sure remove instrumentals is toggled on.
How can I make my AI Waluigi cover sound better?
In order to get the best audio results you should upload an audio clip that is purely an acapella.
Do I own all licensing and copyright of the Waluigi AI cover?
Yes, if you are on a paid plan you own all rights to the audio.