my only concern is the Slide pad.
the psp slim analog stick seriously suck,And its gonna suck even more if the slide pad is spoils after half a year.
I always put my dsl in the pouch, so far no problems at all(my DS was roughly 4 years old).
http://www.focalprice.com/detail_GS116X.html
it cheaper here,
you might want to reuse the silicon pad for the trigger button as replacement dont give he same feel.
X+square
(boost+artillery)
Impusle can't change form, Only strike
same method above with but together with a direction.
for 00 raiser its L trigger
not to sure about SF though (Didn't bother to use him)
probably in seed mode.
@Xdqwerty, Osu! Tatakae! Ouendan! is the Japanese version of the game, different settings/characters/songs but otherwise identical mechanics. I played that before I knew about Elite Beat Agents lol. Both fantastic games https://en.wikipedia.org/wiki/Osu!_Tatakae!_Ouendan