which is usually positive and indicates how much of the measure
has passed at this point. @code{\partial @var{duration}} is
defined such that no numbered bar gets created: when used at the
-beginning of a measure, @code{measurePosition} is set to a
+beginning of a score, @code{measurePosition} is set to a
negative number, implying that the current bar will be
-@emph{preceded} by additional material. When used after a measure
-has already started, however, it moves the requested distance
-before the @emph{end} of the bar.
+@emph{preceded} by additional material. When used elsewhere, it
+moves the requested distance before the @emph{end} of the bar.
@lilypond[quote,verbatim,relative=1]
\set Score.barNumberVisibility = #all-bar-numbers-visible
>>
@end lilypond
+Please make sure that you use the @code{\grace} command for the
+spacer part, even if the visual part uses @code{\acciaccatura} or
+@code{\appoggiatura} because otherwise an ugly slur fragment will
+be printed, connecting the invisible grace note with the following
+note.
+
The use of grace notes within voice contexts confuses the way the voice
is typeset. This can be overcome by inserting a rest or note between the
voice command and the grace note.