Change preprolated duration of ‘leaf’ to ‘new_preprolated_duration’.
It ‘leaf’ carries LilyPond multiplier, change only LilyPond multiplier.
For durations like 3/16, change notehead.
For durations like 5/16, splice tied notes to right.
For durations like 3/14, enclose in tuplet, change notehead.
For durations like 5/14, enclose in tuplet, splice tied notes.
Return list modified original leaf and any additional new leaves.