Multiple voices on a staff
Spine split manipulators (*^
) and spine merge manipulators (*v
) are used
to add or remove voices/layers on a staff. Note that the highest part
on the staff will typically be left most (opposite of the staff ordering
from lowest to highest).
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Notes sounding together in the different voices are placed on the same line, and
if the other voice is sustaining, a .
character is used as a place holder for
that voice (the dot is called a null token in Humdrum terminology).
Partial voices/layers
Voices/layers which do not continue throughout the measure can be encoded in two equivalent manners: (1) splitting and merging the spine as needed in the measure, or (2) adding invisible rests to fill in the voice/layer for the entire measure. For method #1, note that the spine merging cannot occur until the end of both sounding notes in each layer.
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