loop issues

[RayleeZ817]

adding a loop to a midi, makes it unreadable

[Wrymouth]

Mamar inserts pos: commands into the bgm data for matching reasons, if these bgms were converted to .ron files and then back into .bgm files with the pos: commands still there, Mamar won't be able to decode them and you get that error. The solution is to remove all pos: commands from the .ron file before turning it back into a .bgm.