I suppose I'd like a filler that does *not* take up duration
You can use a breath mark for this
http://lilypond.org/doc/v2.12/Documentation/user/lilypond/Curves#Breath-marks
and then make it blank by overriding #'text or #'transparent.
gap = {
\once \override BreathingSign #'text = ""
% \once \override BreathingSign #'X-extent = #'(0 . 2) % to make it wider
\breathe
}
Cheers,
Robin
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