Kerning Group for Stylistic Alternate

Glyphs
#1

I am new to Glyphs and I am using the app to add some stylistic alternates for a font that someone originally digitized for me using FontLab.

Right now I have one for the letter O, view image:

My alternate O (O.ss01) works but I would like to apply the kerning from the normal O to the alternate.

As you can see in the image, I have entered O as a kerning group for both the left and right kerning on O.ss01 but it is not being applied.

What have I done wrong?

#2

After adding the class, you need to apply the kerning to the class to. You can do that by clicking “Compress” in the gear menu in the kerning panel.

#3

Thanks for your response, after re-reading the Handbook I realized my mistake:

My original O glyph was not in a named class, so O.ss01 was referencing nothing.

I thought it would just pick up the O kerning, but I was wrong.