After using Dune 3 for sometime I have some ideas concerning the shortcomings of the GUI.
1. I wish the GUI was in 16:9 format, so I could use a skin more fitting for the panoramic displays thus using the screen real estate more efficiently;
2. I wish all of the three oscillator tabs were visible at all times for example on the left;
3. I don't think Mixer deserves so much space - I think "Unison voices", "Master", "Common" sections should be optimized and integrated with the Mixer section.
4. Arps/Sequencers settings should have their tabs in the bottom section.
In conclusion, using the 16:9 format for the GUI and optimizing space should allow all of the oscillator sections be seen at at all times and make working with the synth faster.
I have attached a super awful mock up made in MS Paint presenting the idea.