I don’t know if you want the beam between the notes, but if not:

I use forced beams (if necessary) with the chord note next to the beam as first 
note.

==================
2 -1 2 3 4 3 4  0.00000 -2 1 1 20 0

60
./
Tc
PMX 2.73
Tt
Beam Error
Arb w180m
g83 zg- a8+ za- b4+ zb- e4s ze- /
b84e a8 g4 g4e //
d2+ zd- c4+ zc- /
[u g83 zg- a8+ za- ] b4+ zb- e4su ze- /
b84e a8 g4 g4e //
d2+ zd- c4+ zc- /
[l g82 zg+ a8- za+ ] b4 zb- e4su ze- /
b84e a8 g4 g4e //
d2+ zd- c4+ zc- /
==================

Andre

From: Don Simons 
Sent: Wednesday, April 10, 2019 1:13 AM
To: 'Werner Icking Music Archive' 
Subject: Re: [Tex-music] PMX stem length error on beamed octave chords

Dirk Laurie wrote

> Op Di. 9 Apr. 2019 om 20:00 het Don Simons <[email protected]>

> geskryf:

> >

> > This seems to fix it:

> >

> > ...

> > Arb w60m

> > [-6 g83 zg- a8+ za- ] b4+ zb- e4s ze- / b84e a8 g4 g4e //

> > d2+ zd- c4+ zc- /

> 

> Thanks.

> 

> > I haven't done lots of checking, but I believe it's been the case since day 
> > 1

> that beam positions are only based on main notes, and ignore chord notes.

> 

> I don't think that can be the reason. If I change the line to

> 

> g82 zg+ a8- za+ b4- zb+ e4s ze+ /

> 

> the lower notes are now the main notes, but the result is as attached.

> The stems are to the left of the noteheads, i.e. downward, but they are

> correct for the chord notes, not the main notes.

 

Hmmm. After a little more checking, I'd say that the beaming commands PMX sends 
to MusiXTeX are the same as if the chord notes weren't there. The reason the 
stems got shifted to the left is buried somewhere in MusiXTeX's handling of the 
chordal notes when they come out on the opposite side of the beam from the main 
notes. Here's a slightly modified example. 

 

[ e82 zg+ f8- za+ ] e- f [ e82 zg f8 za+ ]

 

\pnotes{2.00}\ibu1E1\zq{'G}\qb1{`E}\zq{''A}\tbu1\qb1{``F}\ibu1E1\qb1E%

\tbu1\qb1F\ibu1E1\zq G\qb1E\zq{''A}\tbu1\qb1{``F}\en%

 

The beam initiation and termination commands are the same for each beam.

 



 

Given that this has been going on forever, and because there’s a 
straightforward work-around using PMX’s manual beam height and slope tweaks, 
I’m not highly motivated to upgrade PMX’s logic to deal with it.

 

--Don



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