I'm looking for resources that can teach me how to build an OTF variable font. I'm using Glyphs and I have already created a TTF GX variable typeface.
Recently a client asked me for an OTF format that still behaves as a variable but I don't know how to do it. I have found a lot of articles about VF and about OTF (some of them thanks to this site) but nothing on how to practically create it: which software or plug in...Am I missing something?
Thank you in advance for any information you can provide.