Progress report: Not solved yet, but I see at least part of what's causing
the problem. For multiplicity changes at the staff jump, I had worked out a
scheme for the particular case where the multiplicity decreases right after
the staff jump, for example, 16ths in the bass connected to 8ths in the
treble. But Andre's example ends up exposing two major flaws in the scheme:
At the end of the first segment, it looks forward (in time) for a
lengthening in time values, and that doesn't apply in even the simplest case
of staff-crossing 8th note chords, where the jump goes backwards, from the
second 8th in the lower staff to the first in the upper. The second flaw is
that I based the decision of whether there was a multiplicity change on
looking at the horizontal note spacing after the staff jump at the end of
the first segment. That's also just plain wrong in that the note spacing is
not directly related to note duration if there are shorter notes in another
staff, as in Andre's example.

So I'm still wracking my brain trying to come up with a criterion PMX can
apply at the end of the first segment of a staff-jumping beam to properly
deal with possible multiplicity changes there.

--Don

-----Original Message-----
From: [email protected] <[email protected]> 
Sent: Tuesday, July 28, 2020 11:14 PM
To: 'Werner Icking Music Archive' <[email protected]>
Subject: RE: [Tex-music] cross over beamed notes

Andre, does this do what you want?

====================
c82 zc+ c- zc+ c-4u zc+ //
[u+18 g83 ze g ]j rb4 /
[jl b83 zcr e zcr zb ] g44 ze zc zb /
r1 r r r r4 /
====================

I started with the example from bar 2 of staffcrossall.pmx. Then it did take
lots of trial and error to get it right. But it looks like you confused
things even more by putting in some unnecessary extra [j and ]j .

--Don 

-----Original Message-----
From: TeX-Music <[email protected]> On Behalf
Of Andre Van Ryckeghem
Sent: Tuesday, July 28, 2020 9:30 PM
To: Werner Icking Music Archive <[email protected]>
Subject: [Tex-music] cross over beamed notes

Dear all,

I need help to set this 1st bar right.

In staff 2:
- The second chord looks like a 16th note, probably because of the upper
staff (compare with the 2nd bar)
- in the same chord i want the sequence of the 'c b' changed to 'b c' as in
the 3th chord.

(the upper staff is a song line, i need flagged notes there)

Thanks in advance

Andre

=============
3    2   2 4 2 4  0 -1
1 1  16  .08


btt
./
c82 zc+ c- zc+ c4-u zc+  //
[u+18 g8 ze ]j [j g ]j rb4 /
[ju c8 zb ]j [jl c ] zbr ze b4u zc ze zg   //
rbp /
c1 da e fa g8 aa /
%
c82 zc+ c- zc+ c4-u zc+  //
[u+18 g8 ze ]j [j g ]j rb4 /
[ju c8- zb ]j [jl c ] zbr ze b4u zc ze zg   //
rbp /
rp /
=========== 

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