spacing between staves, globally

[Dirck Nagy]

Hi all

Is there a way to set the default spacing between staves in the  \paper block?

Or is there a way to do it in a different block?

You know, the way you can set attributes like:
\paper {
  #(set-paper-size "letter")

system-system-spacing.basic-distance =  20
markup-markup-spacing.basic-distance =  8
markup-system-spacing.basic-distance =  36
last-bottom-spacing.basic-distance =  24
top-system-spacing.basic-distance =  1
top-system-spacing.basic-distance =  24
}

I can't figure out a way to do this globally.  I'd like to make templates for 
duos, trios, etc, with a slightly wider default staff - staff spacing. (NOT 
system - system)

Here is an example :

\version "2.24.1"


tromboneA= \relative c {

r1 a2 a

}

tromboneB = \relative c {

r1 f2 b

}

tromboneAPart = \new Staff \with {
  instrumentName = "I"

} { \clef bass \tromboneA }

tromboneBPart = \new Staff \with {
  instrumentName = "II"

} { \clef bass \tromboneB }

\score {
  <<
    \tromboneAPart
    \tromboneBPart
  >>

}

thanks so much!

dirck