split-subbeam direction

[Spider]

so i get this far:

      \property Voice.subdivideBeams = ##t
      [\translator Staff=lower \stemUp f,16 c d e \translator Staff=upper 
\stemDown f a c' d']
      [\translator Staff=lower \stemUp e' \translator Staff=upper \stemDown d' 
c' a f
      \translator Staff=lower \stemUp e d c]
      
the last half of the measure has two subbeams, both pointing up. i need the 
second half of the
subbeam to point _down_ so that there is one beam in the middle and the first 
half points up,
second half points down (reverse of the first half of the measure). any ideas?

v 1.6.8

__________________________________
Do you Yahoo!?
The New Yahoo! Search - Faster. Easier. Bingo.
http://search.yahoo.com