I did try using Cheat Engine which i found the address for musou but soon as i tried to edit it my PC just BSoD so won't do that again xD already finish the game but want to play it again with cheats and do 100% shame that any codes are non existent.
@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