### 2.2.24 Cue_clef_engraver

Determine and set reference point for pitches in cued voices.

Properties (read)

> `clefTransposition` (integer)

>   Add this much extra transposition. Values of 7 and -7 are common.

> `cueClefGlyph` (string)

>   Name of the symbol within the music font.

> `cueClefPosition` (number)

>   Where should the center of the clef symbol go, measured in half staff spaces from the center of the staff.

> `cueClefTransposition` (integer)

>   Add this much extra transposition. Values of 7 and -7 are common.

> `cueClefTranspositionStyle` (symbol)

>   Determines the way the ClefModifier grob is displayed. Possible values are ‘`default`’, ‘`parenthesized`’ and ‘`bracketed`’.

> `explicitCueClefVisibility` (vector)

>   ‘`break-visibility`’ function for cue clef changes.

> `middleCCuePosition` (number)

>   The position of the middle C, as determined only by the clef of the cue notes. This can be calculated by looking at `cueClefPosition` and `cueClefGlyph`.

This engraver creates the following layout object(s):

ClefModifier, CueClef and CueEndClef.

`Cue_clef_engraver` is part of the following context(s): DrumStaff, GregorianTranscriptionStaff, KievanStaff, MensuralStaff, PetrucciStaff, Staff, TabStaff and VaticanaStaff.

#### Internals Reference v2.18.2 (稳定分支).