entonio wrote:The PC4 has (what I can only assume is an appropriate for it) 4.32" screen. It's telling (or it should be) of the relative complexity, there is no way the Nautilus/Kronos engines could be practically edited with such a size.
I'm not buying what you're selling.
The PC4 can have a smaller screen because it doesn't have to be a touch screen. You're not dealing with the touch target limitations; instead you have softkeys and hardware controls to get things done, just as you have on the Kross, or on the Tascam DP-32SD, or a range of other products. (Isn't the FA-08 also softkey driven? I think so.)
If you have eyesight limitations, I can see that being a problem, but it's not a reflection on the complexity of the information conveyed. After all, you can do full editing of the ZEN-core engine that Roland packs into the MC-707, and that's a 256x80 backlit LCD, and the ZEN-core engine is very potent.
Bear in mind that the PC4 will do full-on DX7 sounds (and more complex!) using that screen, as well as virtual analogue of massive complexity plus their effects on their engine, so if the size of the scren is your slam-dunk argument on why the PC4 isn't a plausible mid-range competitor to the Nautilus ... I don't think that you're scoring. I would consider the presence of aftertouch and sliders way more relevant and harder to substitute without an additional purchase.
Now, if you can point to some functional underlying element, I'm listening, but I haven't really heard the big news yet.