On a nylon guitar, the bottom 3 strings are not wound. THerefore, you can't get that scrape sound. But, on a lot of the tyros 2 super articulation nylon demos there is significant scraping even when playing in the higher registers. Once you start playing above middle c or there abouts, there should never be string scrape noise, because you'd have to be playing the D string on the 10th fret minimum in order to get the wound string scrape noise on a middle C. Since this is rarely done, Middle C and above would be played on the nonwound strings.