Easy way to transpose voices

[Daniel Ashton]

I have the following in my score block:
<
  \global
  \property Score.skipBars = ##t
  \context StaffGroup <
    \context Staff = rightHand <
      \Key
      \context Voice=one { \voiceOne \VoiceOne }
      \context Voice=two { \voiceTwo \VoiceTwo }
    >
    \context Staff = leftHand <
      \clef F
      \Key
      \context Voice \VoiceThree
      \context Voice=three { \voiceTwo \VoiceFour }
    >
  >
  \context Staff = pedal <
    \clef F
    \Key
    \context Voice \VoiceFive
  >
>

All the \notes are in \VoiceOne, \VoiceTwo, etc.  Is there an easy place 
to put  \transpose af  to move everything down two steps?  Or do I have 
to go into each of the voices?

Ultimately, I would want to keep the voice definitions (the \notes) in 
an original key, and have a given instrument transpose voice(s) for 
itself as necessary.  Is that possible?

--
Daniel Ashton      PGP key available     http://Daniel.AshtonFam.org
mailto:address@hidden         http://ChamberMusicWeekend.org
mailto:address@hidden  ICQ# 9445142      http://ZephyrBrass.com