Over the weekend, I had a deeper dive and the unit is really easy to understand. It can also do not only a melodic arpeggiated sequenced line BUT...it can do one sequenced line for each of four tracks and each track can be assigned a different time signature and a different speed (as a multiple of the tempo). Doing a patch for I Feel Love could potentially include both sequenced basslines (one I/I/-IV/-VII and the other i/I/+V/+VII) and a manually played bassline for accents.
I would also like to see if there is a way to use two tracks, one 4/4 and the other 12/8 to get some rhythmic accents and feels that aren't quantised to regular 1/16 notes. With the two remaing tracks, it's possible to assign effects such as a slapback delay or modulation for further complexity. So that completely blows my world of rhythmic opportunities wide open in ways I never expected but it does require knowing the unit quite well. There's plenty of user patch slots (literally thousands) but not much in the factory presets that showcase the arp abilities.
However. It turns out I've discovered a bug. While it's possible to assign a pitch interval to each individual step, it turns out that when I try to assign an interval above 0 to a step, it transposes the entire track. So that's been logged and may well end up being addressed in the first firmware update. Other users are report other bugs as well so it seems like the firmware is more like a beta version.
It would also be nice to have access to a minor third interval so I can sequence within a key. Once I've explored the possibilities more fully and if they release a firmware update soonish, I'll post a video showing the upper limits of what it can do.