This function collects together sequences of note-lengths and length-rests from within a lengths-pattern. The length and number of sequences can be chosen by the composer via a division list. The numbers in this list divide the lengths- pattern repeatly until the possibilities of the pattern are exhausted. The lengths sequences are then summed together to created aggregates of lengths, thus providing a sustained accompaniment that tracks the main structural divisions of the lengths-pattern.
Use with length-rests-i or add-rests to add length-rests to appropriate values in an aggregate pattern. Or, use = symbols in the matching melody symbol pattern. See also length-condense.
