A tremolo between two notes, e.g. two alternating half notes with 3 strokes ("tremolo beams") between them,
often seen in orchestral string parts. ( and type="stop" in MusicXML)
Note that for these tremolos, each note is notated with the full duration of the tremolo,
but only played for half of it (e.g. notated two half notes = tremolo over one half note duration),
so Note.TypeLength is twice the Note.Length here.
The strokes are drawn in VexFlowMusicSheetDrawer.drawTremolosBetweenNotes().
A tremolo between two notes, e.g. two alternating half notes with 3 strokes ("tremolo beams") between them, often seen in orchestral string parts. ( and type="stop" in MusicXML)
Note that for these tremolos, each note is notated with the full duration of the tremolo,
but only played for half of it (e.g. notated two half notes = tremolo over one half note duration),
so Note.TypeLength is twice the Note.Length here.
The strokes are drawn in VexFlowMusicSheetDrawer.drawTremolosBetweenNotes().