I’m not sure I understand your question. You want a velocity level that triggers ‘no sound’ when you press a piano key? Isn’t that just a ‘rest’?
The dynamic (velocity level) is not real at the first level: it’s too loud.
Let’s try with an acoustic piano or some Stage Piano: the “1127” usually produce a really soft sound, or doesn’t produce sound. In this case, the 1/127 is like a 10/127.
