Hi Steve,

In an include file, I have the following:

showMMRs = {
  \set Staff.keepAliveInterfaces =
    #'( rhythmic-grob-interface
        multi-measure-rest-interface
        lyric-interface
        stanza-number-interface
        percent-repeat-interface) }
letStaffVanish = \set Staff.keepAliveInterfaces = #'()
showLyrics = \set Lyrics.keepAliveInterfaces = #'(lyric-interface 
text-interface)
letLyricsVanish = \set Lyrics.keepAliveInterfaces = #'()

I use those to turn staves and lyrics on/off.

Hope that helps!
Kieren.

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