Hi David,

Thanks. That’s a very illuminating article from Mr Spreadbury.

I gather, then, that beam-quanting is the method used by lilypond to achieve 
the cardinal rule of Ross:

"The placement of a beam follows the cardinal rule that when it falls within 
the staff, its ends must either sit [on], hang [from], or straddle a staff 
line, whether the beam is single or multiple."

This article also, I believe, answers my very question, why my sets of eight 
sixteenths mostly come out flat beamed.

"The beam is also horizontal if the notes in the group are in a repeated 
pattern of pitches;…”

These written out early baroque ornaments are obviously the type of repeating 
group referred to, so it looks like lilypond honours this convention also. The 
attached code illustrates the flattened beams. It does however raise the 
question as to why the second group with stems down have a slope, unless my 
eyes deceive me.

Andrew

— snip

\version "2.19.33"

{
  \clef treble
  g'16[ f' g' f' g' f' e' d']
  \stemDown
  g'16[ f' g' f' g' f' e' d']

}

—  snip


On 8/12/2015, 17:25, "David Wright" <lily...@lionunicorn.co.uk> wrote:


I presume this is to do with Ross's Cardinal Rule; have a look at
http://blog.steinberg.net/2015/03/development-diary-part-10/#more-928


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