Info Catalog lilypond-learning: The revert command lilypond-learning: Tweaking methods lilypond-learning: The overrideProperty command

lilypond-learning: The once prefix

 
 The ‘\once’ prefix
 ..................
 
 Both the ‘\override’ and the ‘\set’ commands may be prefixed by ‘\once’.
 This causes the following ‘\override’ or ‘\set’ command to be effective
 only during the current musical moment before the property reverts back
 to its previous value (this can be different from the default if another
 ‘\override’ is still in effect).  Using the same example, we can change
 the color of a single note like this:
 
      c4 d
      \override NoteHead.color = #red
      e4 f |
      \once \override NoteHead.color = #green
      g4 a
      \revert NoteHead.color
      b c |
      [image src="" alt="[image of music]" text="image of music"]
 
    The ‘\once’ prefix may also be used in front of many predefined
 commands to limit their effect to one musical moment:
 
      c4 d
      \once \stemDown
      e4 f |
      g4 a
      \once \hideNotes
      b c |
      [image src="" alt="[image of music]" text="image of music"]
 
    However, predefined commands of the form ‘\...Neutral’, ‘\...Off’ and
 ‘\un...’ use ‘\revert’ internally rather than ‘\override’ so prefixing
 these with ‘\once’ has no effect.
 

Info Catalog lilypond-learning: The revert command lilypond-learning: Tweaking methods lilypond-learning: The overrideProperty command