Custom Music

Importing custom music is one of the easiest modifications to apply, as it simply involves taking any song and making it compatible with the game. New Super Mario Bros. Wii makes use of the BRSTM format, which is also used by several other Nintendo games.

Finding Music
If the music you want to import is from another game, you can likely find a BRSTM already made out of it on the SmashCustomMusic website. However, it's often unreachable, so it takes a bit of luck.

Prerequisites

 * Audacity (or any other sound editor)
 * BrawlBox
 * BRSAR Patcher

Preparing for Conversion
Open the song in Audacity, apply Normalize, do whatever you want to improve the sound, find the loop, export as WAV, done. If the song you want to replace has multiple channels, see the other page.

Importing the Song
Open BrawlBox, press New > Audio > BRSTM Audio Stream, import the WAV, set the loop points if needed then press Convert. Once it is done, press File > Save to save the file.

Patching the BRSAR
Read the readme.txt file included, i cannot be arsed to write this right now.