...right, gotcha. That's in cents, so to match the 24 I set on the Artiphon it needs to be 2400...which then works in just the same way as Blue. Here's a quick demo. I've tacked on some dodgy Artiphon/Yoshimi guitar strumming as a bonus.
https://youtu.be/pSMEIjNfVv8
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Incidentally I re-read the notes where you were describing how portamento might be used instead...
...set Mode to Legato and just below that set the Portamento checkbox. Next, click on Controllers, and in its window change Portamento Thresh to 0 and Time to about 80. The ribbon should now give you a smooth sweep...
...but, for reference, there's a few complications.
1) If you're gliding to note values instead of using pitchbend, you're only going to get exact notes. Part of the appeal of ribbon controllers is being able to play out of tune...or, let's say, play notes slightly sharp or flat like a violin. You can play vibrato by wiggling a finger. They're not enslaved by equal temperament or any of that stuff; you can play microtonal scales if you choose.
2) You'd need to be able to configure the ribbon controller to send a string of note-ons when dragging from one note to another, rather than sending pitchbend. The Artiphon can do either, but I'm not sure how common that is.
3) You can control 'glide time' in real time on a ribbon controller; fast, slow, variable. I'm not sure how well that would fit with the glide time that's usually associated with portamento controls. I'm not able to test that thoroughly with the Artiphon, because it transmits a string of note-on/note-off as you drag up the fretboard in "send notes" mode, producing a chromatic scale instead of a sweep. In order to use a ribbon with a typical portamento setup, where you hold the start note before pressing the end note, I think you'd need to be able to configure the controller to send a string of only note-ons as you drag, and a set of note-offs when you release, which would get a bit complicated.
...so...yeah, I reckon pitch control via a ribbon controller needs a wide pitchbend approach rather than trying to piggy-back on portamento. Most Windows VSTs tend to follow the approach of Blue illustrated above, with separate bend-up and bend-down response values that can be set to anything you like, counting in semitones, with a maximum of at least 48 for MPE support. But as I say, the control you've provided works fine for me.
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