#### Grace_beam_engraver

Handles Beam events by engraving Beams. If omitted, then notes will be printed with flags instead of beams. Only engraves beams when we are at grace points in time.

Music types accepted:

beam-event

Properties (read)

`subdivideBeams` (boolean)
  If set, multiple beams will be subdivided at beat positions by only drawing one beam over the beat.
`allowBeamBreak` (boolean)
  If true allow line breaks for beams over bar lines.
`beatLength` (moment)
  The length of one beat in this time signature.
`beamMelismaBusy` (boolean)
  Signal if a beam is present.

This engraver creates the following layout objects: Beam.

`Grace_beam_engraver` is part of contexts: DrumVoice, GregorianTranscriptionVoice, TabVoice, VaticanaVoice and Voice

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