How to reduce the size of a grandstaff in relation to the choir part?

[Bernhard Kleine]

Hi,

I have

> blaeserpart = \new GrandStaff <<
>     \new Staff \with {
>     instrumentName = \markup \center-column { "Trompete I" "Trompete II" }
>     shortInstrumentName = \markup \center-column { "Tr.I." "Tr.II." }
>   } <<
>     \new Voice = "trompeteeins" { \voiceOne \scoreATrumpetCI }
>     \new Voice = "trompetezwei" { \voiceTwo \scoreATrumpetCII }
>   >>
>
>   \new Staff \with {
>     instrumentName = \markup \center-column { "Posaune I" "Posaune II" }
>     shortInstrumentName = \markup \center-column { "P.I" "P.II" }
>   } <<
>     \clef bass
>     \new Voice = "posauneeins" { \voiceOne \scoreATromboneI }
>     \new Voice = "posaunezwei" { \voiceTwo \scoreATromboneII }
>   >>
> >>
> \score {
>   \header {
>     title = "Turmbläsermess"
>     subtitle = "mit Sätzen alter Meister"
>     tagline = "gesetzt von Bernhard Kleine 2018"
>  
>     piece = "Kyrie"
>   }
>   <<
>     \blaeserpart
>     \scoreAChoirPart
>   >>
>   \layout { }
> }
this works well but now I would like to reduce the size of the
grandstaff to \small oder \tiny but do not succeed. Putting \tiny in
front of \new Staff oder \new Voice does nothing.

Any help welcome!

Bernhard

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