today it came to my mind that it could become quite handy to see which mod sources are already in use, maybe like this:
So that if one will maybe use a "new attack" or so without changing it for another already connected source, it is immediately visible which mod sources are being used already. A similar visualization could be done in the bottom palette of "per voice mod sources" maybe (for consistency at least).
Also I imagine that this might not be too problematic code-wise, since it would be just a flag with a color change ... maybe?
.... that's not me to judge after all. Anyway I wanted to post this idea. 
All the best,
Manu
