pmx changing number of staffs

[Andre Van Ryckeghem]

Hi,

I like to change the number of staffs from 2 to 3 after 2 systems (music
lines)

Is there anyone who is willing to give me the proper commands or if it is
already mentioned in the mailing list,
is willing to point me to the proper Mutex-Archive mail?

%The first part should meet:
%nv,noinst,mtrnuml,mtrdenl,mtrnump,mtrdenp,xmtrnum0,isig,
    2    2    4    4   0   6   0  -3
% npages,nsyst,musicsize,fracindent
    1  4  20  .09

%The second part should meet:
%nv,noinst,mtrnuml,mtrdenl,mtrnump,mtrdenp,xmtrnum0,isig,
    3    3    4    4   0   6   0  -3
% npages,nsyst,musicsize,fracindent
    1  4  20  .09

This is what i already tried:
----
nv, noinst
3 3
....
\\instrumentnumber 2\
....
L1Mn212bt
%first bar
...
L3Mn3123btt
%next bar
----

for the first lines of music the best i could manage was a first
system of 1 bar if i omit \\instrumentnumber 2\ then the first
system has 1 bar with 3 staffs, the next systems have 2 staffs

Thanks in advance
Andre