>> particulary Xi for flûte, >> http://james-ingram-act-two.de/stockhausen/Xi/sxia1l.html > > I just noticed the parts in IPA (phonetic alphabet). > [y] [ø] [œ] > > First time I see those on a score. Interesting. not that new, has been around since the 60s. for the few composers that work with that and not with language text.