Populate each measure in ‘expr’ according to ‘mode’.
- With mode = ‘big-endian’:
- Populate with big-endian series of notes
summing to measure.meter.effective.duration.
- With mode = ‘little-endian’:
- Populate with little-endian series of notes
summing to measure.meter.effective.duration.
- With mode = ‘meter series’:
- Populate with n total 1/d notes, where
n equals measure.meter.effective.numerator, and
d equals measure.meter.effective.denominator.
- With mode = ‘skip’:
- Populate with exactly one skip, such that
skip.duration.prolated == measure.meter.effective.duration.
Remove spanners attaching to measure.
- When mode is None:
- Empty the contents of each measure.