except IndexError:
sys.stderr.write ("""\nHuh? Slur no %d between (%d,%d), with %d notes""" % (self.number, startnote, endnote, len (chords)))
except IndexError:
sys.stderr.write ("""\nHuh? Slur no %d between (%d,%d), with %d notes""" % (self.number, startnote, endnote, len (chords)))