Tempo is dealing with external USB drives, but it says in the OP that you want to...... burn sounds onto the ISO? Wiiscrubber can be used to extract or insert whatever you want into the ISO. Ah yes, it was wii scrubber, thanks
USB Loaders are usually .dol files. Just stick it in your SD card just like any other homebrew app and boot it through whatever method you use (ie Stack Smash, Homebrew Channel, etc). Do I really need to give you a link to a USB Loader? You say you already have USB Loader GX...
Yes cause i always like to be on the save side
But you dont have to if you dont want to.
Okay thanks guys, gonna try it laterz.