Regarding the different mono channels, I've concluded that most songs are split up differently, for example some songs have stereo snares and some don't.
I've figured out about the extra header information, and I get the same when I remove it. I wonder what the header is for, on .bik I have has the header below. I'm thinking KIBE has to stand for something as it's in all the modern gen. .biks I have.
sorry for upping an epic fail post, but is there any progress?
maybe someone here is good at Wii assembly /debugging, we could arrange co-operation.. please, send pm me!