The task of adding anchor points to the Shaidur font was started, but was not finished. Most of the anchor points in the PUA are just copied from Mezenets and need to be adjusted. Anchor points need to be added to the glyphs in the range accepted by UTC.

Sorochya Nozkha U+1CF3A is not being positioned correctly on the Stopitsa s Ochkom U+1CF57, Perevodka U+1CF58, etc.

We need to find solutions for the alternate placement of pitch marks. While the pitch mark placements are now fully resolved for Znamenny notation, there remain several complex placement issues for Kalashnikov's version of Demestvenny notation. One solution we had discussed was to use the Combining Grapheme Joiner to disrupt the sequence of pitch stacking. I am compiling a list of these problematic neumes and providing images of them to guide us in this work.

There should be a stylistic set ss02 that allows the Kalashnikov-style mechiki to be selected. E.g. U+1CFAA should map to U+EFE6, etc.

When the Zanozhek (U+1CF55) is followed by the Kryzhik (U+1CF40), it should point to the composited form in the PUA. For the default (old style) form, it correctly pints to U+EA7B, but for SS02, it incorrectly points to the variant with the vertical omet (U+EA8D) instead of EADE. This should be an easy fix/

We need to create a stylistic set option so that the Podvertka (RED by default) can be alternatively typeset in BLACK, in which case it also uses lookups to point to composite forms in the PUA.

Explanation: In Type A and B notations, both systems allow for the presentation of the Podvertka in either red or black. Red is historically more accurate, as the Podvertka was introduced by Shaidur as a "markup" symbol below the right side of a base neume to indicate an extra descending note, where previously it was known to add the extra note through context. Over time, even in the Type B usage, the red mark SOMETIMES lost its color in certain contexts, but it was never firmly settled on, so we can find a dual usage of red or black, sometimes even in the same source. Note that its usage as a black mark was "in-line", rather than the red version being a "subscript" mark. See U+EAE1, EAE5, EAE9, EAEB, EAEF and EAF2 for black-podvertka composites. (This usage was also applied to the Statiya in certain popevki; the form with the red podvertka was mistaken for the Polukulizma Malaya, and so they ended up being conflated into a single all-black form.)

The dual usage was carried over into Type A notation, which also added a black-composite version of the Palka with Podvertka (see U+EA9B and EA9D). Type B usage didn't make this switch.

For Demestvenny notation, the seldom-used sequence of Skameitsa klyuchevaya (U+1CF75) plus Slozhitie (U+1CF7D) forms a ligature that cannot be conveniently produced by kerning, as the amount of kerning would be excessive and the anchor points would be problematic. I propose that we add a lookup to point to a newly-added composite (or contracted) character at U+EC11.

In the Mezenets font, selecting Stylistic Set 4 should turn the coloring of PUT/Kazan priznaki off. To do this, we need to duplicate the priznakified glyphs in the PUA and then add mappings to them in SS04.

Here is a TODO for changes to the PUA (blue subzone), best done in this order:

1. Move the following four characters into the PUA (by swapping them out and then deleting the unneeded ones):
   U+1CF70 to U+EAC5 (chaska polnaya)
   U+1CF87 to U+EAFA (zmeitsa)
   U+1CFC3 to U+EB5E (truba)
   U+1CFC6 to U+EB5F (pauk velikii)

2. Delete U+EB20 and U+EB22.

3. Move U+EB5B and U+EB5C into the two slots that were just vacated in #2 above.

4. Move U+EB58 and U+EB59 into the two empty slots at U+EADA and U+EADB.

5. Move U+EB35 to U+EB32.

6. Move U+EB52 to the slot that was just vacated at U+EB35.

7. Move U+EB51 to U+EAC8.

8. Add lookups to the following new characters:
   U+EA9E
   U+EABC
   U+EABD
   U+EB37

A keyboard layout for typesetting Znamenny and Demestvenny notations is needed. Lets give the matter some consideration and see what we can come up with over the next few weeks.

A color-reverse version of the font is needed, for use in polyphonic scores, as well as for explanations of neumes according to the usage of Kalashnikov and an entire manuscript tradition. In this variant font, all base neumes and black marks should appear in red by default, and all red marks should appear in black.

It would be a great idea to resolve the current necessity of typesetting an auxiliary Ravno as the final neume in a sequence, which is illogical musically, but necessary for display. As we had discussed, this may not ever be possible.

Right now color is handled via COLR/CPAL. We should also support the new OpenType-SVG standard:
See here; support is described here

This issue tracker is used for reporting and tracking which software provides correct support for color fonts.