[solved] Can you change 2.0 music?

[Alectric]

what i have found out is if you change any of the BGM music, for example, the theme music, and the play length (2:30) is not the same as the one you replaced it with, you get an error mseegae, but the game still runs, except without music.
how can i change the amount of required time needed to run the music i want?
(BTW, i am not sure if this is a hex-editing problem)