the guitar program can only be strummed, no single notes thou. But lotsa controls, from dynamics controls, up/down stroke differences, muting sound and plentyful of chords to choose from. The english version shud be coming out soon if not wrong, with more features than the japanese version of that "game"
but then, imho for music side with the ds, theres more to do with homebrew/unofficial program written by enthusiasts and distributed over the net than those official releases...