Things to make sure of when finishing up your custom bgm:
- All songs are renamed appropriately
- All Crc32 codes are correct
- That there are 13 songs in the bgm
- Each song is in OGG format
- That the folder (named bgm) is, in fact, named bgm.mrs when finished compressing
As long as all of the above rules are followed, the bgm should work. If not, reply back and I'll help you make it.