Some of the ones I've used, like Hive, for example, the arp pattern is basically offsets from the key you're holding down.
For example, the pattern might be 4 beats - 12 0 0 3. And what that means is if I'm holding C3, it will play C4, C3, C3, D#3. Some work similarly, but with a less intuitive, clunky interface.
Another VST with an arp in it I've used is Helm (free/donate, btw). How it does it, is you hold down a set of keys.. let's say a C major chord, CEG... the VST has a pattern selection that says how to arp through the notes. "Up" just plays C-E-G-C-E-G over and over. Down does it in reverse. UpDown goes C-E-G-E-C-E-G-E over and over.. you get the idea, I assume.
I've never used Dune though. So far, the Arps I've used have worked that way where you're either pressing a single key on your keyboard that it builds a preset pattern off of that you select (ex. a minor scale in that key you hold), or you play several notes, and it arps through each of the notes in some sort of sequence.
I probably butchered this explanation, sorry. lol
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