Re: changing staffgroup-staff-spacing

[Stefan Thomas]

Dear Keith,
thanks very much for Your very good explanations.
I think, the best solution would be to write the dynamics in the lower staff, as You suggested.

2011/7/25 Keith OHara <address@hidden>

On Mon, 25 Jul 2011 11:52:06 -0700, Stefan Thomas <address@hiddencom> wrote:

I thought I could also solve problem in the below quoted snippet with and

override of minimum-Y-extent. But unfortunately, I get a bad collision
between dynamics and and the next staff:

The crescendo to ff spans a line of music that crosses staves.  LilyPond lets you cross any number of staves, but to do so she ignores collisions of spanners that cross staves.  You might want to use #(ly:set-option 'debug-skylines) to see outlines of what items get space reserved for them.

The crescendo runs through the ottava bracket even without the override.  Extending the ff downward with (-12 . 0) lowered the cresc. , but did not push the next staff down because the ff is part of a line that Lilypond believes is allowed to cross staves.

I would place the dynamics in the lower primo staff
 primoB = { \clef bass
 \crescTextCresc
 s2\< s8 s8\ff s4
 }
If you need the dynamics in their logical voice (for MIDI output?) the you could use
  \once\override DynamicLineSpanner #'Y-offset = #-19
before the note with the \< to specify where you want the dynamics line relative to the *upper* staff (its original staff).

I recommend you use "\once" before any override of minimum-Y-extent, and use it on items that are fixed to a staff.  In this case the only solid item I see is the last rest in secundoA
 \once\override Rest #'minimum-Y-extent = #'(0 . 6)
 r2

Four-hand modern piano music will be very frustrating, or maybe very rewarding, to typeset.