You’re right It looks like a bug to me. Maybe you should report it.
Thank you misohoza for confirming it, I thank you.
How do I report the error? Do I have to send some email to the support?
You can connect those parameter to knobs, sliders … but as you discovered it doesn’t work very well.
It is not that they do not work very well, is that they simply hit some jumps that it is impossible to adjust (or have you got it to work decently?)
I guess the best option is probably value box.
In fact, this is the only control that is going well, but it does not have any use since it moves in steps one by one and however small the sample usually has more than 300,000 steps so you can spend a lifetime to adjust it 
please gentlemen of steinberg you need a solution for this …