Its the same as Samba de Amigo (original) -the main menu top down goes: arcade, original, challenge. Internet and options are near the foot of the list.. Do the challenge games to unlock new tunes etc. Options will help you get your height correct for the maracas.
Go to liksang.com to buy maracas - and search google for screenshots to map out the english menus vs the Jp ones. I'm 100% sure you can find an english manual on the web somewhere.. if you search.
that would be sad...i think i'm gonna get the maracas from www.wolfsoft.de since i'm from germany, it'd be somewhat expensive to get them from lik sang....i got my gp32 from there and it was expensive and complicated (had to pay taxes or sthg....)
thanks iainjh....i'll play challenge mode from now on to have EVERYTHING unlocjked till i have my maracas