I've seen this topic and i want to add another "option" to the title: witch is better 'wad unistaller(last version)' or 'Wii memory format'? someone knows?
I used the "two disc" method and works flawless
Wii PAL
firmaware 3.0E
Wiikey (clone)
media: traxdata(burn at 4x)
result: no duplicate channels and a working MP3