Setting the default staff size is straightforward, but I no longer can
remember how to set the default text size in the 2.24.x series (and I
didn't succeed in looking it up in the `lilypond-user` archive).
I seem to recall you can fiddle with the scaling factor in set-global-fonts:
\paper {
#(define fonts
(set-global-fonts
#:roman "Linux Libertine O"
#:sans "Nimbus Sans, Nimbus Sans L"
#:typewriter "DejaVu Sans Mono"
; unnecessary if the staff size is default
#:factor (/ staff-height pt 20)
))
}Paul
