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Re: Breaking autobeams and stem direction with acciaccaturas

From: Trevor Daniels
Subject: Re: Breaking autobeams and stem direction with acciaccaturas
Date: Tue, 1 Apr 2008 12:51:17 +0100

Hi Matthew

I'll have to leave an explanation of this to the more knowledgeable, but the main problem seems to be starting the piece with an \acciaccatura. Doing this causes problems elsewhere (eg tuplets). Try removing it and the overrides then seem to work. Seems like the voice-context overrides have nowhere to go if the first note is an acciaccatura and have no effect. A work-around is to place all the voice-context overrides in the Staff context so they apply to all voices.

The automatic beam breaking by acciaccaturas looks like a lost cause, but manual overrides is a (painful) work-around for this.

Trevor D
----- Original Message ----- From: "Matthew" <address@hidden>
To: <address@hidden>
Sent: Tuesday, April 01, 2008 7:43 AM
Subject: Breaking autobeams and stem direction with acciaccaturas

Hi all

(Hopefully) a quick question about break autobeams and stem direction.

When I compile the following music, each embellishment that contains more than one acciaccatura breaks both the autobeaming and the stem direction that I have
written in.

Bars 1-2 contain the music with embellishments
Bars 3-4 contain the same music without embellishments

If I leave bars 1-2 in, then 3-4 also break. If I comment out bars 1-2, then
bars 3-4 are correct.

What wierdness have I done in my file?

\version "2.10.33"
%Gratuitously borrowed from Hugo Flordal
myautobeams = {
#(revert-auto-beam-setting '(end 1 32 4 4)  5 8)
#(override-auto-beam-setting '(end * * 8 8) 1 4 'Voice)
#(override-auto-beam-setting '(end * * 8 8) 1 2 'Voice)
#(override-auto-beam-setting '(end * * 8 8) 3 4 'Voice)
\set subdivideBeams = ##t
\set beatLength = #(ly:make-moment 1 8) % Subdivide beams on eighths

mynoteproperties = {
\override Stem #'direction = #DOWN
\override Slur #'direction = #UP
\override Tie #'direction = #UP
\override StemTremolo #'slope = #0.45
\override Staff.StaffSymbol #'line-count = 1
\override Staff.BarLine #'bar-size = 5
\set Score.proportionalNotationDuration = #(ly:make-moment 1 16)
% \override Beam #'positions = #'(-5 . -5) %breaks acciaccas
\override Beam #'damping = #100000000 %doesn't work

%my shorthand for embellishments
flR =  { \tiny { \acciaccatura  d8 } \normalsize } % right flam
drR =  { \acciaccatura { \tiny d16[ d] } \normalsize } % right drag
rfR =  { \acciaccatura { \tiny d32[ b b] } \normalsize } %right ruff

staffSnare = \new Staff {
\time 4/4
\clef percussion

\relative c' {

\drR b8 \drR b %first drR points down. It should be up.
% second drR breaks the autobeam and the main note is up!
\rfR d8 \rfR d16 d %second rfR breaks the auto beaming
\flR b8:32->( \times 2/3 {b16) d \flR b->} %upside down! stems up!
d8 b32 d b d
\drR b8 \rfR b16 \times 2/3 {d32 b b} %rfR breaks autobeam
%everything after the rfR in this
line is
%  stem=up -> against the rules
d16 b d b
d16 \drR b32 b d b d b % drR -> see rfL above!
d16. b32 d32 b d b
| \bar "||"

%If I comment out the previous music, then the following turns out correct.
% This music is a copy of the above without the acciaccaturas
b8 b
d8 d16 d
b8:32->( \times 2/3 {b16) d b->}
d8 b32 d b d
b8 b16 \times 2/3 {d32 b b}
d16 b d b
d16 b32 b d b d b
d16. b32 d32 b d b

\bar "|."


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