Partial measures, for example in upsteps, are entered using the
\partial
command:
\partial 16*5 c16 cis d dis e | a2. c,4 | b2
The syntax for this command is
\partial durationThis is internally translated into
\property Timing.measurePosition = -length of durationThe property
measurePosition
contains a rational number
indicating how much of the measure has passed at this point.
This page is for LilyPond-2.0.0 (stable-branch).