If a key is pressed very slowly (velocity 1 by my keyboard), there is still sound coming out. But on real pianos it should be no sound. It's called 'Silent Key' feature on some piano VSTs or by default, velocity 1 results in no sound. Apparently Synchron Pianos do not support this. Even dragging velocity curve down to the ground [0.0,1.0],[1.0,1.0] is no help.
I'm curious if there is anyone who found the same problem. And I'm looking forward to getting an update to fix it.