Hi Siska,
> Unfortunately the curly brace created for these four instruments is way too
> wide. Is there a way to shrink the vertical size of the curly brace for the
> GrandStaff (so that it would have the same width as the curly brace of a
> GrandStaff consisting of only two instruments)?
You could (e.g.)
\override SystemStartBrace #'font-size = #-10
and then stretch the brace.
Hope this helps!
Kieren.
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