⌂ Beam nibs

Beam nibs at the start and end of beams together with beams attached to solitary notes that look like flat flags are possible with a combination of stemLeftBeamCount, stemRightBeamCount, and paired [] beam indicators.

For imitating right-pointing flat flags on lone notes, use paired [] beam indicators and set stemLeftBeamCount to zero. For imitating left-pointing flat flags on lone notes, set stemRightBeamCount to zero instead (line one).

For right-pointing nibs at the end of a run of beamed notes, set stemRightBeamCount to a positive value. For left-pointing nibs at the start of a run of beamed notes, set stemLeftBeamCount instead (line two).

Sometimes it may make sense for a lone note surrounded by rests to carry both a left- and right-pointing nib. Do this with paired [] beam indicators alone (line three).

Note that \set stemLeftBeamCount is always equivalent to \once \set. In other words, the beam count settings are not sticky, so the pair of nibs attached to the lone 16th note in the last example has nothing to do with the \set command for the beam before.