I can't thank you enough for your attention to my question! It was really nice of you to put some time on it and I'm sure, it will benefit other people with the same question.
What I'm actually looking for is a solution to deal with photo-realistic imagery, which uses sequences of rendered images or a bitmap strip for the entire interface, with leds gradually changing intensities and slightly affecting the button, with soft shadows, blurred reflections and refractions, etc...
I've been trying to find a platform for this kind of development. I'm aware of flowstone and synthedit and tested both, but in terms of audio quality, developed content, flexibility and the possibility of further development in the future, it's really hard to beat csound.
What you've got so far with is nothing short of amazing.If you'll have someday widgets to deal with bitmaps, Cabbage will be the best tool for vst creation.
My question now is: will you consider bitmap manipulation in Cabbage in the future?
many thanks again!