you sort of get an idea. these are really high quality samples, they turn out to work out pretty fine, they have already pre-builtin music phrases and gestures, harmonized for different root keys and pitch classes so the only thing I actually have to do is to sort of map them to simple harmonic progressions, and record the phrases I wish to get into the music. a really cool example can be found here in the following demo (a friend of mine has some of the sample libraries, and he will allow me to copy some of those by the end of the week, or put them in an ftp server)