David B
pc-king The demos are absolutely ridiculous and embarrassing.
Yikes! Picky, picky. 😀
I've heard over the years that VSL pianos are better intended for movie scoring and such, and not ideal for solo piano. Since I'm more of a beginner/intermediate player, a lot of the precision necessary for a professional pianist is lost on me. However, here are the things from your list that I have noticed using VSL products.
pc-king b) Differences between adjacent keys in terms of loudness at the same velocity level.
Thankfully, that can be mitigated with single note editing in the superb Synchron Piano software.
pc-king 5. Unrealistic implementation of the sustain pedal:
The lack of sympathetic resonances and una corda always made VSL pianos sound a little sterile to me.
pc-king c) When using the robot finger, it was forgotten that the keys are a little easier to play with the sustain pedal pressed because the dampers do not have to be raised with the force of the finger. (They are already up.) This meant that two quiet notes, pressed once in and once outside the sustain pedal, were significantly different in volume at exactly the same velocity level. Of course, you expect a fuller sound with the pedal because the other strings resonate, but it must not be massively louder. An example is Chopin's first ballad, bar 9. pianow has already mentioned this problem.
This is not a problem on all of their pianos, but I did inquire when I noticed it on my Bosendorfer Imperial. I sent VSL recordings of the issue and I was surprised by their response. They basically said it's the nature of the piano or something like that. I can't quite remember. There was no admission that it was actually a sampling error which I think it is.
I really can't answer your questions about the Modern D, but here are few thoughts.
pc-king I also think that the sound in the upper half of the keyboard could be a bit (!) more colorful, airy and lively.
I don't hear an imbalance between the upper and lower registers. The entire piano appears to be consistently voiced. One thing I like about the subdued tone and voicing of this piano is that I can play it indefinitely without getting ear fatigue. It's mellow and warm with a tone that I'd like to have if this piano was in my living room.
pc-king Is the sympathetic resonance added on top of the pedal resonance (which isn't what would happen in a real piano)?
I don't know, but sympathetic resonance is where the difference between the Modern D and VSL is night and day. The Modern D does not have that sterile feel I mentioned earlier with the VSL pianos. The Modern D is more lush, and forgive me @Pete14 for saying this, more organic. 😀
The Modern D is the current king of virtual pianos, in my humble opinion, of course.
God Bless,
David
