After putting everything together, the result of my next test was the first image shown above. brsar file (duh), so I tried just exporting the original track in brawlbox and replacing it with that exported one (totally unaltered, just exported and put back into the. I already figured that this must be related to the altered.
Normally it should look like this after a few seconds: Testing the results in Dolphin I got past the safety screen showing the Wiimote and then got stuck in a loop of this pattern moving around: brsar file and replace the old one in WiiScrubber. What I tried was using WiiScrubber to extract the file 'rev_tengoku.brsar', which contains all the background music, and replace one of the music files in BrawlBox (right-click on the file in the left column->Replace->choose. I came up with the idea of replacing some music files in the game stated above, basically to add vocals to a few songs (meaning the length of them wouldn't change at all).