Glitch that happens after i change form, scrolling the stage(like in Kefka's fight)

- Change the battle music during the battle, in the case is even possible to select all the music, or just the default ones used for battle?

You could invoke a song change anywhere in the code I think, in bank C1 or C2. Here's the victory fanfare example:

Code:

C1/0152:    A92F        LDA #$2F        (47 = fanfare song data #)
C1/0154:    8D0113      STA $1301
C1/0157:    A9FF        LDA #$FF        (Volume: FF = normal)
C1/0159:    8D0213      STA $1302
C1/015C:    220400C5    JSL $C50004     (Changes the music to fanfare)

For the rest, I am unsure how it would be possible to code or do.