I don't have any idea how far along development of Dune 3 is, but I wanted to throw this out there for consideration. One thing I notice about Dune 2 is how close in structure it is to the Yamaha Motif XS series and later synths. Like Dune 2, they have up to 8 parts (what they call "elements") each with its own oscillator, wave forms etc). All of that is available in what Yamaha calls "Voice" mode...where you call up a single patch made up of the combined characteristics of up to 8 elements, just like we can with Dune 2. But there another mode called "Performance Mode" where you can combine up to 4 patches, each with its own ARP (or not), and effects.
I've thought it would be cool to have a performance mode equivalent with the next version of Dune, and the ability to route the audio outputs of each separately. It might be too hard on the resources to pull this off, I don't know. But thought I'd mention it, just in case it might be something worth considering.
Thanks, Synapse team, for making such a versatile and great sounding VI!
Donald M