ChordName placement - above or below staff

[Fred Smith]

I believe I found that this question has already been posted - however,  I did not see an answer. Any pointers would greatly be appreciated!
  
  I'm trying to create lead sheets using lilypond.  However, I'm  unable to control whether chord names are printed above or below the  staff - the position seems to be affected by (in my limited  understanding) unrelated changes. The example below was done using  lilypond 2.8.5 on a Windows build.
  
  When the key is set (\key aes \major), the chord names appear below the  staff. When the key is not set (if you comment that line out), the  chord names appear above the staff. Is there a way to explicitly place  the chord names in relation to the staff?
  
  Thanks again for any pointers to documentation on how to control this!  ( I would really like to always have chord names above the staff - all  the documentation and examples I have found show them as appearing  above the staff by default.)
  
 
 -fred
  
  
  %{ ------------ Open the song: ---------------- %}
  {
  \key aes \major
  {\time  4/4}    
    {    
    <<     
        \chords {c1 d1} 
        {f'8 aes'8~ \times 2/3 {aes'8 f'8 aes'8}  bes'8 aes'4 f'16  des'16}          
    >>
    }
  %{ ------------ and finish ------------ %}
  }

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