I just purchased two "sample libraries." To my sursprise it was not what I expected. It was all just single sounds of instruments, I wanted different guitar riffs. I know when I go on the computer and type in sample's on a search engine or e bay I get to hear examples (short melodies) and they are all different riffs. How are you supposed to know the difference when makiing a purchase? On the topic of single hit sounds. What is point of these? Are they controlled by the keyboard and can you then play different recorded pitches like you would on the actual instrument?