### 2.2.75 Note_head_line_engraver

Engrave a line between two note heads, for example a glissando. If `followVoice` is set, staff switches also generate a line.

Properties (read)

> `followVoice` (boolean)

>   If set, note heads are tracked across staff switches by a thin line.

This engraver creates the following layout object(s):

Glissando and VoiceFollower.

`Note_head_line_engraver` is part of the following context(s): CueVoice, GregorianTranscriptionVoice, KievanVoice, MensuralVoice, PetrucciVoice, TabVoice, VaticanaVoice and Voice.

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