Hi Werner,
Alternatively you may try to use \afterGrace to insert the \clef
before the bar line, although this would probably require some
manual spacing too.
This doesn't work at all: `\afterGrace` doesn't accept a clef, as the
image shows.
afterGrace is defined as
#(define-music-function (fraction main grace) ((scale?) ly:music?
ly:music?) ...)
You write
\afterGrace 1 { s8 \clef "bass" } | c,1
but 1 is a valid scale? because of
(define-public (scale? x)
(or (and (rational? x) (exact? x) (not (negative? x)))
(fraction? x)
(and (ly:moment? x) (scale? (ly:moment-main x)))))
in scm/c++.scm.
Lukas
