### 2.2.88 `Note_head_line_engraver`

Engrave a line between two note heads in a staff switch if `followVoice` is set.

`followVoice` (boolean)
This engraver creates the following layout object(s): `VoiceFollower`.
`Note_head_line_engraver` is part of the following context(s) in `\layout`: `CueVoice`, `GregorianTranscriptionVoice`, `KievanVoice`, `MensuralVoice`, `PetrucciVoice`, `TabVoice`, `VaticanaVoice` and `Voice`.