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Tweaking clef properties

Changing the clef glyph, its position, or the ottavation does not change the position of subsequent notes on the staff. To get key signatures on their correct staff lines, middleCClefPosition must also be specified, with positive or negative values moving middle C up or down respectively, relative to the staff’s center line.

For example, \clef "treble_8" is equivalent to setting the clefGlyph, clefPosition (the vertical position of the clef itself on the staff), middleCPosition, and clefTransposition. Note that when any of these properties (except middleCPosition) are changed a new clef symbol is printed.

The following examples show the possibilities when setting these properties manually. On the first line, the manual changes preserve the standard relative positioning of clefs and notes, whereas on the second line, they do not.

{
  % The default treble clef
  \key f \major
  c'1
  % The standard bass clef
  \set Staff.clefGlyph = "clefs.F"
  \set Staff.clefPosition = 2
  \set Staff.middleCPosition = 6
  \set Staff.middleCClefPosition = 6
  \key g \major
  c'1
  % The baritone clef
  \set Staff.clefGlyph = "clefs.C"
  \set Staff.clefPosition = 4
  \set Staff.middleCPosition = 4
  \set Staff.middleCClefPosition = 4
  \key f \major
  c'1
  % The standard choral tenor clef
  \set Staff.clefGlyph = "clefs.G"
  \set Staff.clefPosition = -2
  \set Staff.clefTransposition = -7
  \set Staff.middleCPosition = 1
  \set Staff.middleCClefPosition = 1
  \key f \major
  c'1
  % A non-standard clef
  \set Staff.clefPosition = 0
  \set Staff.clefTransposition = 0
  \set Staff.middleCPosition = -4
  \set Staff.middleCClefPosition = -4
  \key g \major
  c'1 \break

  % The following clef changes do not preserve
  % the normal relationship between notes, key signatures
  % and clefs:

  \set Staff.clefGlyph = "clefs.F"
  \set Staff.clefPosition = 2
  c'1
  \set Staff.clefGlyph = "clefs.G"
  c'1
  \set Staff.clefGlyph = "clefs.C"
  c'1
  \set Staff.clefTransposition = 7
  c'1
  \set Staff.clefTransposition = 0
  \set Staff.clefPosition = 0
  c'1

  % Return to the normal clef:

  \set Staff.middleCPosition = 0
  c'1
}

\paper { tagline = ##f }