8va/Clef change with multiple subspines

[bel28kent]

m. 30, staff1: the spine is split into two subspines on the second beat. At that beat, there should be a clef change that applies to the entire staff/spine. Only subspine 1(a) is rendering in bass clef, currently. This issue persists whether the clef change is encoded in both subspines, or the subspines are merged for the clef change.

View in VHV

[bel28kent]

Also op28, m. 81 and m. 83

[bel28kent]

@craigsapp This is an issue that I have encountered with both alla ottava and clef tandem interpretations. Almost always, the 8va or clef change applies to the staff/spine, and so should apply to all voices/subspines. But it is not clear as a general user how this is defined in VHV.

It seems that in Humdrum, if a tandem interpretation should apply to the entire spine, then either all subspines need to be merged, followed by the interpretation, then re-split, or the tandem interpretations need to be placed one for each subspine. This allows for a meaningful difference between the following changes. At the last change, following the logic of Humdrum as I understand it, the right subspine is still in *clefG2. This is probably not common, but I have seen it in 20th century scores.

**kern
*part1
*staff1
*clefG2
*k[]
*a:
*M2/4
=1-
*^
4a	4cc
4b	4dd
*v	*v
*clefF4
=2
*^
4A	4c
4B	4d
*clefG2	*clefG2
=3	=3
4a	4cc
4b	4dd
*clefF4	*
=4	=4
4A	4a
4B	4b
*v	*v
==
*-
!!!filter: flipper -a

View in VHV

I believe that in VHV, whenever there is an 8va or clef change verovio automatically tries to apply it to the entire spine. This is the intent in the case of the Scriabin scores, but it does not always work whether you merge spines, put the tandem only in one, or in all of the spines.

This issue is actually related to when the spin split and clef change happens after the bar line. All of these examples involve a split and clef change after the first measure of the bar.

[bel28kent]

See also scriabin-op11_no02, left hand, throughout.

[bel28kent]

Issue fixed by moving spine split to beginning of measure and adding hidden rest.