octave doubling

[Atte André Jensen]

I'm looking at:
http://lilypond.org/doc/v2.1/input/test/out-www/lily-1706119646.ly

Looks nice, but it seams that added articulations get's printed twice. 
How can this be avoided? I tried to hide them from one "version" of the 
music, byy putting \property Voice.Script \set #'transparent = ##t in 
lowerOctave like this, but it doesn't work (seems the stems get hidden 
instead):


lowerOctave = \notes <<
    \context Thread=lowerOne {
        \transpose c' c
        \property Voice.Script \set #'transparent = ##t
        \lowerOne
    }
    \context Thread=lowerOne {
        \repeat "unfold" 4 { \firstEight }
    }
>>

--
peace, love & harmony
Atte

http://www.atte.dk