I haven’t seen posts about Orbas yet and mine just showed up, so if anyone has been considering ordering one I can confirm that an Orba can be used as a controller for the OP-Z. Velocity and pitch bend work, and the tilting function on the Orba can be used as well. Tapping on the Orba is a lot easier to use than the OP-Z keys, especially for drums/samples. I haven’t tinkered around enough with the MIDI to see if any other Orba controls (spin, shake, swirl, etc.) can be used with the OP-Z, but I imagine some mapping is possible.
The connection is direct USB-C to USB-C, no adapters needed. I am planning to experiment with bluetooth/iPad/AUM possibilities next and I will try connecting an OP-1 to the Orba with an iPad as a MIDI host as well.
The Orba has been finicky to work with so far and the Orba app/onboard sounds feel very limited and slow. It isn’t possible to switch between kits/synths on the Orba (or change how they sound), you have to load/unload one static preset at the time through the app and it has been tedious. Hopefully, Artiphon will focus all their energy into improving the app options next as the Orba definitely has serious potential as a pocketable music maker, but the nature of the static presets, limited scales, and app loading make it less flexible than something like a 33 K.O. for making unique music without any other gear/effects involved.
That said, 90% of my interest in the Orba was in having a small, wireless MPE controller for other gear and software. If it was only a controller without any onboard sounds or looping, then I would still say that Artiphon did a pretty amazing job for $100. If you would pay $100 to have it as just a controller, then I would recommend it.
I might make a video this weekend demonstrating what it is like to use the Orba with the OP-Z if I can find the time. If I do I will post a link in this thread for anyone curious.