How to deactivate the velocity for a complete sound

I’d like for a sound always full level - regardless of how hard a key is pressed.
How can i do that?

Deactivate velocity:
Vel
As seen in the manual. I would recommend to also use a computer keyboard.
If you’re using a MIDI keyboard, make sure “Velocities” in preferences is deactivated too:

i’d like to have it only for one sound - not for the whole Redux.

Ok, Redux. You can activate/deactivate velocity right here on the left:
rdv
You could leave velocity deactivated while typing the notes of the one sound and activate it when finished.

I play with normal keyboard via midi.

The only way to switch velocity off i found do deactivate it for every sample.
Select all and middle below Vel→Vol switch off. But for a complete sound (containing with samples) i haven’t found it.