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I'm attempting to make a font with some OpenType features for the first time, using Fontlab, and, guess what - it's slightly confusing...
what I'd like OpenType to do is:
for lots of specific character pairs, substitute pairs of alternate characters
so, for example, if someone types 'AB' I'd like OpenType to substitute glyph A_2 followed by glyph B_2...
I was kind of thinking I could do this with a contextual alternate feature like
sub A' B' by A_2 B_2;
but that doesn't seem to compile
sub A B' by B_2;
compiles OK, but doesn't really do what I want...
does what I'm trying to do make any sense? is it possible?
would a better way be to make all my desired glyph combinations as ligature glyphs? (and also make all the individual alternate glyphs separately available)
any help would be great