Problems with Guitar Freaks (Jap) PLZ HELP ME!

i simply cant make this game work!!!
i dunno why!
i configured the PAL/NTSC settings, sound, well, everything (every other game i use runs great)
when i load the game, the "Caution" screen appears (with the 2 guitars on the sides)
but i cant go any further!!!!
plzzzzzzzzz
someone help meeeeeeeeee