FYI. You could have posted in VC 5 too and attached a image, and deleted this thread. But now i answer here.
I have not seen your link. I don't seem to work for me.
If it's aliasing, then aliasing is quite normal in a digital system like a softsynth i believe. I think it's depended on the used samplerate in the application, and that you can do something about it like using oversampling techniques, but i don't think you can fully avoid it.
The frequences that's being affected is hard to say, but also depending on the samplerate i think.
I don't know what samplerate Arturias synths use. I would like to know, and i would like an option to use oversampling. But the better the quality the more CPU usage. So there is things to consider.
I'm not a technician, so this may not be correct.
The main thing is, if it's audioble and in a bad way or not. What do you think? Is it audioble? Is it bad?
Have you tested any softsynth that don't have behaviors like you describe?
I would also like to know, what you think you see on that spectrum? Especially what you see, but does'nt see in other softsynths.
I'm not saying nothing is wrong, and that it can't be better etc.. But what do you wan't to say and get out of your observations and posts here and in the VC5 Modular forum?