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How does one add the "Glyph Variants" Apple Advanced Typography (AAT) feature to a font? (See the circled panel in the screenshot below for Hoefler Text.)
Apple's docs are far from clear on how to add this. In the Morph Input File (MIF), I have used "Character Alternates" (Namecode 17, also visible as a closed panel in the screen shot above) to define sets of alternate glyphs, but that doesn't give me the fancy pop-ups that are context-sensitive to the selected characters, only radio buttons to identify alternate character sets.
I'd appreciate any tips.