Is it possible to add custom music or sounds to a game with WiiRd, or do you have to mod your Wii?
neither nor, you'd have to hack the game's ISO reburn the whole game-DVD and find a modchip that lets you play this DVD.
Okay, but I thought you could upload content in the Wii memory.
The music doesn't load to the memory, the game loads the music from the ISO itself.
and by the way, all you need for having custom music in Brawl is an MP3-player, AV cables and the right instructions (http://de.youtube.com/watch?v=YsiSLX2UEVc).