Ok. Ill try to put it into an easy to read format (although I dont know why, because i need help from somebody who knows more about this than I do but whatever)
Basically the only way possible (at the moment) to install things on our wiis is through wads. So there is no way possible to do this with save file hacking or anything else. So first we need to have a 'base' song to work with so we dl a free one from the store. Then we dump it using the fs dumper, not the nand dumper and we look through the files. apparently 00000005 directory is where they keep the dlc files for games (according to 'any title deleter') so we browse to that directory and find a few files, mainly title.tmd and a few 23 or so megabyte files, and also a few smaller 0000000000xx.app files, that are the banner files, but remember its dlc so it really dosent have a banner, just a 'save file' picture.
so, in my testing i was just trying to repack the ones that i currently have. So when i stick it into a wad packer it says that there are not enough files. Looking closer into this, i found out that the title.tmd lists exactly 21 app files to pack. So i hexed that file to list only the 'banner' file and another small file that lists some important things, and the 23 mb song. This compiles correctly without error. Great. So i then fire up wad manager to install it, it finds it it installs the title and the ticket, but at the first app file it always fails with error -2011. I also discovered the title will show up on my system menu under save games as a blank 'bubble' without any text or picture. also clicking on this will not do anything. (I used any title deleter to remove this, and seemed to work.) So it seems that it is trying to install the 'banner' but gets stuck somewhere in doing this, probably because it is not a real channel and a 'invisible' one. Also i have tried using u8 extractor on the banner file, and it does not recognize it as one, so maybe its a special kind of banner that needs some extra something in it.
If anyone has any tips on what to do to fix this from packing it with special flags (im pretty sure i've tried everything, even renaming it ) to more hex editing, i would love to test out some of the ideas
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Major EDIT
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So pretty much disregard all the errors that i had in my original post. I figured it out. I had the wrong damn common key!!!!!! I've been at this for like a month trying to figure out what the hell was wrong. I am so freaking PISSED.
So now the wad installs correctly! and the save file is clickable and everything
However when loading up wt, it gives me an error that the dlc is screwed up and i need to re download all of my purchases. so off to the drawing board again. Im pretty sure its possible to mess with the files its checking but it will take a while.
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short version of all of above:
I'm able to install song wads in 'wii' mode, but wt does some verifying somewhere