giancarlo,
thank you so much for participating, anything you can contribute is extremely valuable to this forum.
I think the GUI is actually quite fantastic in its versatility. I believe most people look at it and disregard instantly as it dosen't look like its hardware counterparts which is a shame because it is quite simple to learn in 5 minutes if you actually play around with it.
What is so fantastic about this GUI and needs to be understood is that where all other GUI's control one piece of equipment Nebula can control any number of virtual equipment you wish to throw at it, i.e. Reverbs, Eq's, Compressors, Tape Saturation, Effects, Guitar Cabinet IR's etc. So the GUI needs to be versitile. The benefit is that even though you may sometimes have controls in Nebula assigned to nothing... you only have to learn 1 GUI to control hundreds or thousands of pieces of virtual equipment. Traditionally you would have to learn 100 different GUI's for a 100 different vst's. Now that in it's own right is worth all the eye sores in the world.
I hope that this discussion develops further as i think Nebula is a fantastic piece of software/tool and could still promise to fill that last 10% of quality where standard IR convolution falls. Please don't disregard this forum just because one or two people here don't understand the complexity involved in committing to such a project as you have. Most of us know you can't just 'wack' a new gui on it by drawing it up in MS paint and copying and pasting it into word and typing "cout<<new GUI for Nebula; int[] new_buttons = { 1, 2, 3, 4, 5, 6, 7, 8}; while new_buttons do".
I have faith in your product, and i think you can compare it to something like FMR's Really nice compressor/preamp. They put all the quality into the parts (the important bits), not the cosmetics or presentation... and have developed a succesfull and fantastic product.
Best of luck for the future.